EP1221838A1 - Microcapsules - Google Patents

Microcapsules

Info

Publication number
EP1221838A1
EP1221838A1 EP00962517A EP00962517A EP1221838A1 EP 1221838 A1 EP1221838 A1 EP 1221838A1 EP 00962517 A EP00962517 A EP 00962517A EP 00962517 A EP00962517 A EP 00962517A EP 1221838 A1 EP1221838 A1 EP 1221838A1
Authority
EP
European Patent Office
Prior art keywords
microcapsules
active ingredient
phase
oil
agrochemical active
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Withdrawn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
EP00962517A
Other languages
German (de)
English (en)
Inventor
Wolfgang Podszun
Björn CHRISTENSEN
Norbert Schick
Joachim Krüger
Hilmar Wolf
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 AG
Original Assignee
Bayer AG
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 AG filed Critical Bayer AG
Publication of EP1221838A1 publication Critical patent/EP1221838A1/fr
Withdrawn legal-status Critical Current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
    • A01N25/26—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
    • 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
    • A01N25/08—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 solids as carriers or diluents
    • A01N25/10—Macromolecular compounds
    • 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
    • A01N37/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom having three bonds to hetero atoms with at the most two bonds to halogen, e.g. carboxylic acids
    • A01N37/34—Nitriles
    • 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
    • A01N43/64—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with three nitrogen atoms as the only ring hetero atoms
    • A01N43/647—Triazoles; Hydrogenated triazoles
    • A01N43/653—1,2,4-Triazoles; Hydrogenated 1,2,4-triazoles
    • 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
    • A01N47/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid
    • A01N47/08—Biocides, pest repellants or attractants, or plant growth regulators containing organic compounds containing a carbon atom not being member of a ring and having no bond to a carbon or hydrogen atom, e.g. derivatives of carbonic acid the carbon atom having one or more single bonds to nitrogen atoms
    • A01N47/28—Ureas or thioureas containing the groups >N—CO—N< or >N—CS—N<
    • A01N47/36—Ureas or thioureas containing the groups >N—CO—N< or >N—CS—N< containing the group >N—CO—N< directly attached to at least one heterocyclic ring; Thio analogues thereof
    • 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

  • the present invention relates to new microcapsules containing agrochemical active substances, a process for the preparation of these microcapsules and their use for the application of agrochemical active substances.
  • Microencapsulation is a method that has been used for a long time, for example to convert dyes, inks, flavors, active pharmaceutical ingredients or agrochemicals into preparations from which the enclosed ones are made
  • Components are released under controlled conditions.
  • Microcapsules are already known from WO 95/13698, which contain a solid, biologically active compound, dispersed in a liquid.
  • WO 92/10285 describes microcapsules which contain agrochemical active ingredients, such as herbicides, insecticides or fungicides or also fertilizers, and have a temperature-dependent permeability profile. Furthermore, WO 91/12884 discloses a method by which thermosensitive and / or photosensitive microcapsules can be produced.
  • EP-A 0 270 742 relates to microcapsules, the ingredients of which are fungicides and the capsule walls are made of polyamide or polyurethane.
  • GB-A 2 011 341 is based on a special process for microencapsulation
  • Phase interface condensation directed in which a reactive amine component is released from a salt.
  • JP-A 1998-059 811 and JP-A 1998-182 319 relate to microcapsules with a shell made of polyurea and a core made of polyurethane gel which contains allyl isothiocyanate as the liquid active ingredient.
  • microcapsules described above are their relatively low mechanical stability, which is undesirable in many applications.
  • microcapsules containing agrochemical active ingredients which are generally known as aqueous
  • Dispersions are used due to mechanical stress, such as occurs when pumping, pumping, stirring or spraying, damage to the shell and associated unwanted premature release of the active ingredients.
  • Another disadvantage of the known microcapsules is that the shells are damaged or even burst if the capsule dispersion after the
  • Outdoor application dries out due to weather conditions or is subjected to drying and rewetting cycles.
  • agrochemical active ingredient in relation to the total weight of the capsules is between 1 and 75% by weight.
  • microcapsules according to the invention can be produced by:
  • aO aO monomers which can form a continuous solid polymer phase, a2) a liquid oil phase, a3) at least one agrochemical active ingredient, a4) at least one oil-soluble dispersant, a5) optionally additives, a6) optionally initiators and catalysts and a7) optionally at least one oil-soluble wall educational component,
  • microcapsules according to the invention are very well suited for the application of agrochemical active ingredients, in particular for spray application and for seed treatment.
  • microcapsules according to the invention are better suited for the application of agrochemical active substances, in particular solid active substances, than the previously known preparations which are most similar in constitution. Above all, it is unexpected that the microcapsules according to the invention, despite the thin capsule walls, have a significantly higher mechanical stability than similar previously described formulations of this type.
  • microcapsules according to the invention are distinguished by a number of advantages. This enables them to release the active components in a uniform amount over a fairly long period of time. Finally, it is also of particular advantage that the microcapsules according to the invention are largely stable under the mechanical stresses that occur in practice.
  • the polymer material for the shell (I) of the microcapsules according to the invention are preferably polyurethanes, polyureas, polyamides, melamine-formaldehyde condensation products, phenol-formaldehyde-urea condensation products and
  • Gelatin including hardened gelatin and gelatin complex coacervates, for example complex coacervates made of gelatin and acacia, in question. Envelopes made of polyurea are particularly preferred.
  • Such polyurea casings can preferably be
  • the solid polymer phase (a1) present in the microcapsules according to the invention can belong to different polymer classes. So the polymer consist, for example, of polymerized units of vinyl monomers and crosslinkers.
  • Vinyl monomers in the sense of the invention are primarily aromatic vinyl compounds such as styrene, ⁇ -methylstyrene, ethyl methylbenzene, vinyl naphthalene and
  • (Meth) acrylate such as methyl methacrylate, ethyl acrylate and hydroxyl ethyl methacrylate, benzyl acrylate, benzyl methacrylate, phenylethyl acrylate, phenylethyl methacrylate, phenylpropyl acrylate, phenylpropyl methacrylate, phenyl nonyl acrylate, Phenylnonylmethacrylat, 3-methoxybutyl acrylate, 3-methoxybutyl methacrylate, butoxyethyl acrylate, butoxyethyl methacrylate, diethylene glycol acrylate, diethylene glycol monomethacrylate , Triethylene glycol monoacrylate, triethylene glycol monomethacrylate, tetraethylene glycol monoacrylate, tetraethylene glycol monomethacrylate, furfury acrylate, furfuryl methacrylate, tetrahydrofurfur
  • Vinyl monomers with C 4 -C 22 -alkyl radicals such as n-butyl acrylate, n-butyl methacrylate, isobutyl acrylate, isobutyl methacrylate, n-hexyl acrylate, n-hexyl methacrylate, ethylhexyl acrylate, ethylhexyl methacrylate, n-octyl acrylate, n-octyl acrylate, are preferred methacrylate, decyl acrylate, decyl methacrylate, dodecyl acrylate, dodecyl methacrylate,
  • Examples of particularly preferred (meth) acrylic acid esters are: n-butyl acrylate, n-butyl methacrylate, isobutyl acrylate, isobutyl methacrylate, n-hexyl acrylate, n-hexyl methacrylate, ethylhexyl acrylate, ethylhexyl methacrylate, n-octyl acrylate, n-octyl methacrylate, Decyl acrylate, decyl methacrylate, dodecyl acrylate, dodecyl methacrylate, stearyl acrylate, stearyl methacrylate, cyclohexyl acrylate, cyclohexyl methacrylate, 4-tert-butylcyclohexyl methacrylate, benzyl acrylate, benzyl methacrylate, butyl acrylate phenylethyl acryl
  • crosslinkers are allyl methacrylate, ethylene glycol dimethacrylate, ethylene glycol diacrylate, butanediol diacrylate, butanediol dimethacrylate,
  • the continuous solid polymer phase (al) can also consist of polyurethane or
  • Polyurea exist. Polyurethanes are preferred. Suitable polyurethanes can be produced from aliphatic and / or aromatic isocyanates and di- or polyols. In the present context, isocyanates are understood to mean difunctional and multifunctional aromatic and aliphatic isocyanates. Examples include: m-phenylene diisocyanate, p-phenylene diisocyanate, 2,4-
  • polyester and polyether diols can be used as diols.
  • Polyether diols based on polyethylene oxide, polyethylene oxide / polypropylene oxide and tetrahydrofuran are preferred.
  • polyol compounds such as trimethylolpropane extended by ethylene oxide or castor oil, can also be used proportionately.
  • Suitable polymers are polyesters, polyamides and condensation products made from phenols, urea and formaldehyde.
  • Vegetable and animal oils, synthetic oils and mineral oils are suitable for the liquid oil phase (a2).
  • Mineral oils are preferred.
  • Mineral oils purified by distillation as well as undistilled oils, so-called residual oils, are suitable.
  • Mineral oils with a boiling point of 75 to 370 ° C., in particular 100 to 370 ° C., are particularly preferred. In many cases, mineral oils with a high paraffin and isoparaffin content are well suited.
  • agrochemical active substances are understood to mean all substances customary for plant treatment. Fungicides, bactericides, insecticides, acaricides, nematicides, molluscicides,
  • Herbicides plant growth regulators, plant nutrients and repellents. Solid agrochemical agents are preferred.
  • fungicides are: 2-anilino-4-methyl-6-cyclopropyl-pyrimidine; 2 ', 6'-dibromo-2-methyl-4'-trifluoromethoxy-4'-trifluoromethyl-1, 3-fhiazole-5-carboxanilide; 2,6-dichloro-N- (4-trifluoromethylbenzyl) benzamide; (E) -2-methoximino-N-methyl-2- (2-phenoxyphenyl) acetamide; 8-hydroxyquinoline sulfate; Methyl- (E) -2- ⁇ 2- [6- (2-cyanophenoxy) pyrimidin-4-yloxy] phenyl ⁇ -3-methoxyacrylate; Methyl (E) methoximino [alpha- (o-tolyloxy) -otolyl] acetate; 2-phenylphenol (OPP), aldimorph, ampropylfos, anilazine, aza,
  • Difenoconazole dimethirimol, dimethomorph, diniconazole, dinocap, diphenylamine
  • Fluoromide Fluoromide, fluquinconazole, flusilazole, flusulfamide, flutolanil, flutriafol,
  • copper preparations such as: copper hydroxide, copper phthalate,
  • Tebuconazole Tebuconazole, tecloftalam, tecnazen, tetraconazole, thiabendazole, thicyofen, thiophanate-methyl, thiram, tolclophos-methyl, tolylfluanid, triadimefon, triadimenol,
  • Triazoxide trichlamide, tricyclazole, tridemo ⁇ h, triflumizole, triforin, triticonazole,
  • bactericides bronopol, dichlorophene, nitrapyrin, nickel-dimethyldithiocarbamate, kasugamycin,
  • insecticides examples include abamectin, acephate, acrinathrin, alanycarb, aldicarb, alphamethrin, amitraz,
  • Fenamiphos Fenazaquin, Fenbutatinoxid, Fenitrothion, Fenobucarb, Fenothiocarb, Fenoxycarb, Fenpropathrin, Fenpyrad, Fenpyroximat, Fenthion, Fenvalerate, Fipronil, Fluazuron, Flucycloxuron, Flucythrinat, Flufenoxuron, Fufone Proxophonophone, Fufionproxophon, Fufonproxophon, Fufonproxophon, Fufone Prox, Fufion, Fufion, Fufion, Fufion, Fufone
  • HCH heptenophos, hexaflumuron, hexythiazox, Imidacloprid, isazophos, isofenphos, isoprocarb, isoxathion, ivermectin, lambda cyhalothrin, lufenuron,
  • Mecarbam Mevinphos, Mesulfenphos, Metaldehyde, Methacrifos, Methamidophos, Methidathion, Methiocarb, Methomyl, Metolcarb, Milbemectin, Monocrotophos, Moxidectin,
  • Parathion A Parathion M, Permethrin, Phenthoat, Phorat, Phosalon, Phosmet, Phosphamidon, Phoxim, Pirimicarb, Pirimiphos M, Pirimiphos A, Profenophos, Promecarb, Propaphos, Propoxur, Prothiophos, Prothoat, Pymetrozin, Pyrach
  • Tebufenozide Tebufenpyrad
  • Tebupirimiphos Teflubenzuron
  • Tefluthrin Temefos
  • Terbam Terbufos
  • Tetrachlorvmphos Thiacloprid, Thiafenox, Thiamethoxam
  • molluscicides are metaldehyde and methiocarb.
  • herbicides examples are:
  • Anilides e.g. Diflufenican and Propanil
  • Aryl carboxylic acids e.g. Dichloropicolinic acid, dicamba and picloram
  • Aryloxyalkanoic acids e.g. 2,4-D, 2,4-DB,
  • Aryloxy-phenoxy-alkanoic acid esters e.g. Diclofop-methyl, fenoxaprop-ethyl, fluazifop-butyl, haloxyfop-methyl and quizalofop-ethyl
  • Azinones e.g. Chloridazon and norflurazon
  • Carbamates such as, for example, chloropropham, desmedipham, phenmedipham and propham; Chloroacetanilides, such as, for example, alachlor, acetochlor, butachlor, metazachlor, metolochlor, pretilachlor and propachlor; Dinitroaniline, such as Oryzalin, Pendimethalin and trifluralin; Diphenyl ethers such as acifluorfen, bifenox, fluoroglycofen, fomesafen, halosafen, lactofen and oxyfluorfen; Ureas such as chlorotoluron, diuron, fluometuron, isoproturon, linuron and methabenzthiazuron; Hydroxylamines, such as, for example, alloxydim, clethodim, cycloxydim, sethoxydim and tralkoxydim; Imidazolinones such as imazethapyr,
  • Nitriles e.g. Bromoxynil, dichlobenil and ioxynil; Oxyacetamides, e.g. mefenacet; Sulfonylureas, e.g. Amidosulfuron, bensulfuron-methyl, chlorimuron-ethyl, chlorosulfuron, cinosulfuron, metsulfuron-methyl, nicosulfuron, primisulfuron, pyrazosulfuron-ethyl, thifensulfuron-methyl, triasulfuron and tri-benuron-methyl; Thiol carbamates, e.g. Butylates, cycloates, dialates, EPTC,
  • Triazines e.g. Atrazin, cyanazin, simazin, simetryne, terbutryne and terbutylazin
  • Triazinones e.g.
  • Others such as Aminotriazole, Benfuresate, Bentazone, Cinmethylin, Clomazone, Clopyralid, Difenzoquat, Dithiopyr, Ethofumesate, Fluorochloridone, Glufosinate, Glyphosate, Isoxaben, Pyridate, Quinchlorac, Quinmerac, Sulphosate and Tridiphane.
  • Chlorcholine chloride and ethephon are examples of plant growth regulators.
  • plant nutrients are customary inorganic or organic fertilizers for supplying plants with macro and / or micronutrients.
  • microcapsules according to the invention contain one or more oil-soluble dispersants (a4).
  • oil-soluble dispersants (a4) are fatty acids, fatty acid esters and especially fatty acid amides. Examples include decanecarboxamide and dodecanecarboxamide. Oil-soluble polymers with a molecular weight of 2,000 to 1,000,000 are also very suitable. Polymers with a proportion of polymerized units of C 8 to C 22 alkyl (meth) acrylates and / or vinyl esters of C 8 to C are preferred 22 carboxylic acids. Polymers with polymerized units of stearyl methacrylate, lauryl methacrylate and vinyl stearate may be mentioned as examples.
  • Copolymers of C 8 to C 2 alkyl (meth) acrylates or vinyl esters of C 8 to C 2 carboxylic acids with hydrophilic monomers are particularly suitable.
  • hydrophilic monomers are polymerizable olefinically unsaturated compounds which are wholly or partly soluble in water (more than 2.5% by weight at 20 ° C.).
  • Examples include: acrylic acid and its alkali and ammonium salts, methacrylic acid and their alkali and ammonium salts, hydroxyethyl methacrylate, hydroxyethyl acrylate, diethylene glycol monoacrylate, Diethylenglykolmonometh- acrylate, triethyleneglycol monoacrylate, triethylene, glycol monoacrylate tetra, tetraethylene glycol, glycerol acrylate, aminoethyl methacrylate, N , N-dimethylaminoethyl methacrylate, acrylamide, methacrylamide, vinyl pyrolidone and vinyl imidazole. Aminoethyl methacrylate, N, N-dimethylaminoethyl methacrylate, acrylamide, methacrylamide, vinyl pyrrolidone and vinyl imidazole are preferred.
  • Particularly preferred oil-soluble dispersants are copolymers of
  • microcapsules according to the invention can contain additives (a5) which are usually used as additives in plant treatment products. These include, for example, dyes, antioxidants and cold stabilizers.
  • Suitable dyes are soluble dyes or sparingly soluble color pigments, such as titanium dioxide, carbon black or zinc oxide.
  • Suitable antioxidants are all substances which can normally be used for this purpose in plant treatment products. Sterically hindered phenols and alkyl-substituted hydroxyanisoles and hydroxytoluenes are preferred.
  • Suitable cold stabilizers are all substances which can normally be used for this purpose in plant treatment products. Urea, glycerol or propylene glycol are preferred.
  • Microcapsules can be varied within a wide range. So the shares are
  • shell (I) generally between 2 and 20% by weight, preferably between 4 and 16% by weight,
  • continuous solid polymer phase (al) generally between 10 and 60% by weight, preferably between 20 and 40% by weight
  • liquid oil phase (a2) generally between 12 and 60% by weight, preferably between 12 and 50% by weight of agrochemical active substances (a3) in general between 1 and 75% by weight, preferably between 5 and 60% by weight,
  • oil-soluble dispersant (a4) generally between 0.1 and
  • additives generally between 0 and 20 wt .-%, preferably between 0 and 5 wt .-%, based on the sum of (I) and (II).
  • the particle size of the microcapsules according to the invention can be varied within a certain range. It is generally between 1 and 100 ⁇ m, preferably between 5 and 50 ⁇ m, particularly preferably between 5 and 30 ⁇ m.
  • the core of the microcapsules according to the invention is preferably multi-phase, particularly preferably three-phase.
  • the polymer phase forms a preferably open sponge structure, the pores of which fill the oil.
  • the active substance is predominantly in the oil phase as a finely dispersed phase.
  • microcapsules according to the invention can be present either as solid particles or as a dispersion of solid particles in an aqueous phase.
  • microcapsules according to the invention are prepared in such a way that an organic phase of the components mentioned under (A) is in an aqueous
  • Suitable monomers (aO) which can form a continuous solid phase are those monomers which are suitable for forming the polymers mentioned under (a1). Such monomers have already been mentioned in connection with the description of components (a1).
  • Catalysts (a6) which serve to harden monomers and optionally contain oil-soluble wall-forming components (a7).
  • Suitable initiators for curing vinyl monomers are preferably:
  • Peroxy compounds such as dibenzoyl peroxide, dilauryl peroxide, bis (p-chlorobenzoyl peroxide), dicyclohexyl peroxidicarbonate, tert-butyl peroctoate, 2,5-bis (2-ethylhexanoylperoxi) -2,5-dimethy_hexane and tert.-amylhexanoxy-2 , furthermore azo compounds, such as 2,2'-azobis (isobutyronitrile) and 2,2'-azobis (2-methylbutyronitrile).
  • Organic tin compounds such as dibutyltin dilaurate and tertiary amines such as triethylamine are suitable as catalysts for curing isocyanates with di- or polyols to give polyurethanes.
  • Oil-soluble wall-forming components (a7) are used when shells are to be constructed from polyurea or polyamide.
  • polyurea these are the above-mentioned difunctional and multifunctional aromatic or aliphatic isocyanates; for polyamides they are dicarboxylic acid dichlorides, e.g. Succinic acid dichloride, sebacic acid dichloride, terephthalic acid dichloride and
  • Adipic acid Adipic acid.
  • the organic phase is mixed thoroughly, preferably with the aid of mills, in particular ball mills and bead mills, the particles of solid agrochemical active ingredients (a3) being comminuted to particle sizes of 0.1 to 5 ⁇ m, preferably 0.2 to 2 ⁇ m.
  • the homogenized organic phase obtained is generally stable to settling, ie the active substance particles or droplets do not sediment in periods of minutes to a few hours.
  • the organic phase is distributed into droplets in an aqueous phase.
  • Mixing units with high shear forces in particular high-speed stirrers and
  • Rotor-stator mixer used.
  • the droplet size formed is 1 to 100 ⁇ m, preferably 5 to 50 ⁇ m, particularly preferably 5 to 30 ⁇ m.
  • the particle size can be adjusted via the size of the shear forces or the speed of the stirrer or mixer.
  • the aqueous phase contains at least one water-soluble dispersant (b2).
  • Suitable dispersants are all substances which can normally be used for this purpose. Natural and synthetic, water-soluble polymers such as gelatin, starch and cellulose derivatives, in particular cellulose esters and cellulose ethers, moreover polyvinyl alcohol, polyvinyl pyrrolidone, polyacrylic acid, polymethacrylic acid and copolymers of (meth) acrylic acid and (meth) acrylic acid esters and lignin sulfonic acid may be mentioned as preferred.
  • Mixtures of various dispersants are also very suitable, for example mixtures of polyvinyl alcohol and lignosulfonic acid sodium salt.
  • the amount of dispersant is generally 0.2 to 10% by weight, preferably 0.5 to 5% by weight, based on the aqueous phase.
  • the aqueous phase contains at least one water-soluble wall-forming component (b3).
  • This is understood to mean substances which are caused by physical precipitation or chemical reaction, if appropriate in combination with the Oil-soluble wall-forming component (a7) form a polymer at the interface between the organic phase and the aqueous phase.
  • Polymers, polyamides, gelatins and formaldehyde resins which are particularly suitable according to the invention for the shell are polyham materials.
  • diamines or polyamines are added to the aqueous phase, which react with isocyanates or dicarboxylic acid dichlorides from the organic phase to form polyureas or polyamides.
  • Ethylene diamine in particular should be mentioned as the diamine.
  • Preferred polyamines are diethylenetriamine and triethylenetetramine. Particularly tight casings are achieved if polyamines are used at least in part.
  • gelatin is dissolved in the aqueous phase in a basic or neutral medium at a temperature above the gelation temperature of 37 ° C., for example at 40 ° C.
  • an anionic polymer is added to form the coacervate, for example by adding citric acid to a pH between 3.5 and 5.0 and cools to temperatures between 0 ° C and 20 ° C.
  • Suitable synthetic anionic polymers are alkaline copolymers with built-in units of e.g.
  • Capsules containing gelatin can be hardened with conventional hardening agents, such as formaldehyde or glutardialdehyde, with an alkaline one for thorough hardening pH is adjusted.
  • the gelatin shell generally takes several hours to form and harden.
  • formaldehyde and phenolic and / or amine reactive components are added to the aqueous phase.
  • Suitable phenolic reactive components are, for example, phenol, resorcinol and pyrocatechol.
  • amine reactive components are urea, melamine and arnmoniak-formaldehyde condensation products, such as hexamethylenetetramine.
  • the formaldehyde resins are formed at an elevated temperature of, for example, 50 to 90 ° C. at an acidic pH.
  • the temperature can be varied within a certain range. In general, temperatures between 60 ° C and 100 ° C, preferably between 70 ° C and 100 ° C. The curing takes 1 to a few
  • the stirring speed is not critical in this reaction step. Low stirring speeds are sufficient to keep the capsules formed in suspension.
  • the microcapsules can remain in dispersion or by conventional methods, e.g. isolated by filtration or decanting and optionally dried after one or more washes.
  • microcapsules according to the invention are outstandingly suitable for the application of agrochemical active substances to plants and / or their habitat. They ensure the release of the active components in the desired amount over a longer period of time. They also have high mechanical stability.
  • microcapsules according to the invention can be used as such either in solid form or as suspensions, if appropriate after prior dilution with water be used in practice.
  • the application is carried out according to customary methods, for example by pouring, spraying, spraying or scattering.
  • the application rate of the microcapsule formulations according to the invention can be varied within a relatively wide range. It depends on the respective agrochemical active ingredients and their content in the microcapsules.
  • a mixture of 750 g imidacloprid, 1 550 g mineral oil (technical white oil Ene ⁇ ar T 017), 188 g alkylaryl polyglycol ether and 2.5 g defoamer (silicone mass) is 3 hours at a temperature between 30 ° C and 40 ° C. ground in a pearl mill.
  • a settling-stable dispersion results, in which 90% of the active ingredient particles have a particle size between 1 and 4 ⁇ m.
  • This mixture is emulsified at room temperature in a solution of 205 g of deionized water, 1.8 g of polyvinyl alcohol (Mowiol 26-88) and 5.3 g of lignin sulfonate (Borresperse Na) using a rotor-stator mixer (Silverson
  • the resulting emulsion is transferred to a stirred reactor. 5.8 g of a fifty percent aqueous solution of diethylenetriamine are added to the mixture present. The stirring speed is set to 350 revolutions per minute. The temperature is raised from room temperature to 55 ° C within 1 hour and then held at 55 ° C for 2 hours. Then you heat up
  • Example 2 60 ° C and holds this temperature for 4 hours. 350 g of a dispersion of microcapsules are obtained; the particle size is 2 to 25 ⁇ m; the active ingredient content 8.4% by weight.
  • Example 2 60 ° C and holds this temperature for 4 hours. 350 g of a dispersion of microcapsules are obtained; the particle size is 2 to 25 ⁇ m; the active ingredient content 8.4% by weight.
  • This mixture is emulsified at room temperature in a solution of 205 g of deionized water, 1.8 g of polyvinyl alcohol (Mowiol 26-88) and 5.3 g of lignin sulfonate (Borresperse Na) using a rotor-stator mixer (Silverson
  • the resulting emulsion is transferred to a stirred reactor. 5.8 g of a fifty percent aqueous solution of diethylenetriamine are added to the mixture present. The stirring speed is set to 350 revolutions per minute. The temperature is raised from room temperature to 55 ° C within 1 hour and then held at 55 ° C for 2 hours. Then you heat up
  • a mixture of 760 g of tebuconazole, 1 550 g of mineral oil (technical white oil Ene ⁇ ar T 017), 188 g of alkylaryl polyglycol ether and 2.5 g of defoamer (silicone mass) is for 3 hours at a temperature between 30 ° C and 40 ° C. ground in a pearl mill.
  • a settling-stable dispersion results, in which 90% of the active ingredient particles have a particle size between 1 and 4 ⁇ m.
  • This mixture is emulsified at room temperature in a solution of 205 g of deionized water, 1.8 g of polyvinyl alcohol (Mowiol 26-88) and 5.3 g of lignin sulfonate (Borresperse Na) using a rotor-stator mixer (Silverson L4R).
  • the resulting emulsion is transferred to a stirred reactor. 5.8 g of a fifty percent aqueous solution of diethylene triamine are added to the existing mixture.
  • the stirring speed is set to 350 revolutions per minute.
  • the temperature is raised from room temperature to 55 ° C within 1 hour and then held at 55 ° C for 2 hours.
  • the mixture is then heated to 60 ° C. and held at this temperature for 4 hours.
  • 350 g of a dispersion of microcapsules are obtained; the particle size is 2 to 10 ⁇ m; the drug content
  • a mixture of 760 g dichlobenil, 1 550 g mineral oil (technical white oil Ene ⁇ ar T 017), 188 g alkylaryl polyglycol ether and 2.5 g defoamer (silicone mass) is 3 hours at a temperature between 30 ° C and 40 ° C. ground in a pearl mill.
  • a settling-stable dispersion results, in which 90% of the active ingredient particles have a particle size between 1 and 4 ⁇ m.
  • This mixture is emulsified at room temperature in a solution of 205 g of deionized water, 1.8 g of polyvinyl alcohol (Mowiol 26-88) and 5.3 g of lignin sulfonate (Borresperse Na) using a rotor-stator mixer (Silverson L4R).
  • the resulting emulsion is transferred to a stirred reactor. 5.8 g of a fifty percent aqueous solution of diethylene triamine are added to the existing mixture.
  • the stirring speed is set to 350 revolutions per minute.
  • the temperature is raised from room temperature to 55 ° C within 1 hour and then held at 55 ° C for 2 hours.
  • the mixture is then heated to 60 ° C. and held at this temperature for 4 hours.
  • 350 g of a dispersion of microcapsules are obtained; the particle size is 2 to 20 ⁇ m; the drug content
  • a mixture of 760 g of tebuconazole, 1 550 g of mineral oil (technical white oil Ene ⁇ ar T 017), 188 g of alkylaryl polyglycol ether and 2.5 g of defoamer (silicone mass) is for 3 hours at a temperature between 30 ° C and 40 ° C. ground in a pearl mill.
  • a settling-stable dispersion results, in which 90% of the active ingredient particles have a particle size between 1 and 4 ⁇ m.
  • This mixture is emulsified at room temperature in a solution of 205 g of deionized water, 1.8 g of polyvinyl alcohol (Mowiol 26-88) and 5.3 g of lignin sulfonate (Borresperse Na) using a rotor-stator mixer (Silverson L4R).
  • the resulting emulsion is transferred to a stirred reactor. 5.8 g of a fifty percent aqueous solution of diethylene triamine are added to the existing mixture.
  • the stirring speed is set to 350 revolutions per minute.
  • the temperature is raised from room temperature to 55 ° C within 1 hour and then held at 55 ° C for 2 hours.
  • the mixture is then heated to 60 ° C. and held at this temperature for 4 hours.
  • 350 g of a dispersion of microcapsules are obtained; the particle size is 2 to 10 ⁇ m; the drug content
  • a mixture of 760 g of thiacloprid, 1 550 g of mineral oil (technical white oil Ene ⁇ ar T 017), 188 g of alkylaryl polyglycol ether and 2.5 g of defoamer (silicone mass) is for 3 hours at a temperature between 30 ° C and 40 ° C. ground in a pearl mill.
  • a settling-stable dispersion results, in which 90% of the active ingredient particles have a particle size between 1 and 4 ⁇ m.
  • This mixture is emulsified at room temperature in a solution of 205 g of deionized water, 1.8 g of polyvinyl alcohol (Mowiol 26-88) and 5.3 g of lignin sulfonate (Borresperse Na) using a rotor-stator mixer (Silverson L4R).
  • the resulting emulsion is transferred to a stirred reactor. 5.8 g of a fifty percent aqueous solution of diethylene triamine are added to the existing mixture.
  • the stirring speed is set to 350 revolutions per minute.
  • the temperature is raised from room temperature to 55 ° C within 1 hour and then held at 55 ° C for 2 hours.
  • the mixture is then heated to 60 ° C. and held at this temperature for 4 hours.
  • 350 g of a dispersion of microcapsules are obtained; the particle size is 2 to 30 ⁇ m; the drug content
  • a mixture of 760 g of tebuconazole, 1 550 g of mineral oil (technical white oil Ene ⁇ ar T 017), 188 g of alkylaryl polyglycol ether and 2.5 g of defoamer (silicone mass) is for 3 hours at a temperature between 30 ° C and 40 ° C. ground in a pearl mill.
  • a settling-stable dispersion results, in which 90% of the active ingredient particles have a particle size between 1 and 4 ⁇ m.
  • This mixture is emulsified at room temperature in a solution of 205 g of deionized water, 1.9 g of polyvinyl alcohol (Mowiol 26-88) and 5.7 g of lignin sulfonate (Borresperse Na) using a rotor-stator mixer (Silverson L4R).
  • the resulting emulsion is transferred to a stirred reactor.
  • the existing mixture is mixed with 5.9 g of a fifty percent aqueous solution of diethylene triamine.
  • the stirring speed is set to 350 revolutions per minute.
  • the temperature is raised from room temperature to 55 ° C within 1.5 hours and then held at 55 ° C for 1.5 hours.
  • the mixture is then heated to 60 ° C. and held at this temperature for 4 hours.
  • 350 g of a dispersion of microcapsules are obtained; the particle size is 3 to 40 ⁇ m; the active ingredient content 8.4% by weight.
  • a mixture of 760 g dichlobenil, 1 550 g mineral oil (technical white oil Ene ⁇ ar T 017), 188 g alkylaryl polyglycol ether and 2.5 g defoamer (silicone mass) is 3 hours at a temperature between 30 ° C and 40 ° C. ground in a pearl mill.
  • a settling-stable dispersion results, in which 90% of the active ingredient particles have a particle size between 1 and 4 ⁇ m.
  • This mixture is emulsified at room temperature in a solution of 205 g of deionized water, 1.9 g of polyvinyl alcohol (Mowiol 26-88) and 5.7 g of lignin sulfonate (Borresperse Na) using a rotor-stator mixer (Silverson L4R).
  • the resulting emulsion is transferred to a stirred reactor.
  • the existing mixture is mixed with 5.9 g of a fifty percent aqueous solution of diethylene triamine.
  • the stirring speed is set to 350 revolutions per minute.
  • the temperature is raised from room temperature to 55 ° C within 1.5 hours and then held at 55 ° C for 1.5 hours.
  • the mixture is then heated to 60 ° C. and held at this temperature for 4 hours.
  • 350 g of a dispersion of microcapsules are obtained; the particle size is 7 to 90 ⁇ m; the active ingredient content 8.5% by weight.
  • a mixture of 760 g of thiacloprid, 1 550 g of mineral oil (technical white oil Ene ⁇ ar T 017), 188 g of alkylaryl polyglycol ether and 2.5 g of defoamer (silicone mass) is for 3 hours at a temperature between 30 ° C and 40 ° C. ground in a pearl mill.
  • a settling-stable dispersion results, in which 90% of the active ingredient particles have a particle size between 1 and 4 ⁇ m.
  • This mixture is emulsified at room temperature in a solution of 205 g of deionized water, 1.9 g of polyvinyl alcohol (Mowiol 26-88) and 5.7 g of lignin sulfonate (Borresperse Na) using a rotor-stator mixer (Silverson L4R).
  • the resulting emulsion is transferred to a stirred reactor.
  • the existing mixture is mixed with 5.9 g of a fifty percent aqueous solution of diethylene triamine.
  • the stirring speed is set to 350 revolutions per minute.
  • the temperature is raised from room temperature to 55 ° C within 1.5 hours and then held at 55 ° C for 1.5 hours.
  • the mixture is then heated to 60 ° C. and held at this temperature for 4 hours.
  • 350 g of a dispersion of microcapsules are obtained; the particle size is 3 to 45 ⁇ m; the active ingredient content 8.5% by weight.
  • a mixture of 760 g imidacloprid, 1 550 g mineral oil (technical white oil Ene ⁇ ar T 017), 188 g alkylaryl polyglycol ether and 2.5 g defoamer (silicone mass) is 3 hours at a temperature between 30 ° C and 40 ° C. ground in a pearl mill.
  • a settling-stable dispersion results, in which 90% of the active ingredient particles have a particle size between 1 and 4 ⁇ m.
  • the mixture is then heated to 55 ° C. for four hours, then cooled to room temperature and neutralized with fifty percent aqueous sodium hydroxide solution. 400 g of a dispersion of microcapsules are obtained; the particle size is 77 ⁇ m; the active substance content is 7.5% by weight. stability test
  • microcapsule dispersion 7.5 g of microcapsule dispersion were made up to 75 ml with water and placed together with 30 g glass beads, each having a diameter of 3 mm, in a closable 250 ml polyethylene wide-mouth bottle. The bottle was shaken mechanically at 25 ° C for 20 minutes.
  • microcapsules were observed with a microscope before and after shaking. The proportion of perfect and damaged capsules for a particle number of at least 50 was counted and calculated in percent. Those capsules in which oil had escaped and / or the casing was deformed or burst were rated as damaged.
  • microcapsule dispersions used and the test results are shown in the following table.

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  • Life Sciences & Earth Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Dentistry (AREA)
  • Pest Control & Pesticides (AREA)
  • Plant Pathology (AREA)
  • Engineering & Computer Science (AREA)
  • Agronomy & Crop Science (AREA)
  • Wood Science & Technology (AREA)
  • Zoology (AREA)
  • Environmental Sciences (AREA)
  • Toxicology (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Manufacturing Of Micro-Capsules (AREA)

Abstract

L'invention concerne de nouvelles microcapsules comprenant : I) une enveloppe extérieure en matériau polymère et II) le contenu de ladite enveloppe extérieure, qui comprend : a1) une phase polymère solide continue ; a2) une phase huileuse liquide ; a3) au moins un principe actif agrochimique ; a4) au moins un agent dispersant soluble dans l'huile et a5) éventuellement des additifs. La teneur en principe actif agrochimique se situe entre 1 et 75 % en poids par rapport au poids total des capsules. L'invention concerne également un procédé permettant de préparer ces nouvelles microcapsules et leur utilisation pour appliquer des principes actifs agrochimiques.
EP00962517A 1999-10-01 2000-09-19 Microcapsules Withdrawn EP1221838A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19947147 1999-10-01
DE19947147A DE19947147A1 (de) 1999-10-01 1999-10-01 Mikrokapseln
PCT/EP2000/009268 WO2001024631A1 (fr) 1999-10-01 2000-09-19 Microcapsules

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EP1221838A1 true EP1221838A1 (fr) 2002-07-17

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JP (1) JP2003517464A (fr)
KR (1) KR20020029123A (fr)
CN (1) CN1377227A (fr)
AU (1) AU7421100A (fr)
BR (1) BR0014674A (fr)
CA (1) CA2385991A1 (fr)
DE (1) DE19947147A1 (fr)
IL (1) IL148410A0 (fr)
MX (1) MXPA02003256A (fr)
WO (1) WO2001024631A1 (fr)
ZA (1) ZA200201468B (fr)

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DE10117784A1 (de) * 2001-04-10 2002-10-17 Bayer Ag Mikrokapseln
DE10223916A1 (de) * 2002-05-29 2003-12-11 Bayer Cropscience Ag Mikrokapsel-Formulierungen
EP1519995B1 (fr) * 2002-06-19 2016-02-24 THOR GmbH Materiau d'enduction contenant des microcapsules de biocide
DE10359792A1 (de) * 2003-12-19 2005-07-21 Bayer Technology Services Gmbh Mehrphasige Wirkstoffformulierung
CN100444733C (zh) * 2004-03-22 2008-12-24 侯金荣 天然除虫菊素微胶囊剂植物农药及其应用
CN100444732C (zh) * 2004-03-22 2008-12-24 侯金荣 天然除虫菊素微胶囊剂植物农药的制备方法
EP1795071A1 (fr) * 2005-12-07 2007-06-13 Incotec International B.V. Pastilles/capsules modifiées comprenant un ingrédient actif
GB0526416D0 (en) * 2005-12-23 2006-02-08 Syngenta Ltd Formulation
CA2690070A1 (fr) * 2007-06-21 2008-12-24 Syngenta Participations Ag Procede d'amelioration de la croissance d'une plante
JP5603645B2 (ja) * 2009-04-30 2014-10-08 日本エンバイロケミカルズ株式会社 マイクロカプセル剤およびその製造方法
JP5439952B2 (ja) * 2009-05-29 2014-03-12 住友化学株式会社 マイクロカプセルの製造方法
WO2011156048A1 (fr) * 2010-06-07 2011-12-15 Dow Agrosciences Llc Suspensions de microcapsules comprenant des niveaux élevés d'ingrédients actifs sur le plan agricole
JP5763570B2 (ja) * 2011-03-11 2015-08-12 大阪ガスケミカル株式会社 徐放性粒子およびその製造方法
CN102239831A (zh) * 2011-05-03 2011-11-16 谭晓辉 噻唑磷微胶囊悬浮剂及制备方法
CN106070275A (zh) * 2016-06-03 2016-11-09 安徽广信农化股份有限公司 制备均一粒径的吡唑醚菌酯微囊的方法
CN108575993A (zh) * 2018-04-19 2018-09-28 河北威远生物化工有限公司 一种草铵膦可分散微囊油悬浮剂及其制备方法
CN110876378A (zh) * 2019-12-11 2020-03-13 利民化学有限责任公司 一种智能微胶囊悬浮剂及其制备方法

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IL148410A0 (en) 2002-09-12
WO2001024631A1 (fr) 2001-04-12
BR0014674A (pt) 2002-06-11
CN1377227A (zh) 2002-10-30
JP2003517464A (ja) 2003-05-27
KR20020029123A (ko) 2002-04-17
ZA200201468B (en) 2003-04-30
AU7421100A (en) 2001-05-10
CA2385991A1 (fr) 2001-04-12
DE19947147A1 (de) 2001-04-05
MXPA02003256A (es) 2002-10-31

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