Nanoparticulate Active Ingredient Formulations
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Abstract
The present invention relates to aqueous dispersions comprising a nanoparticulate formulation of crop protection agents in which the nanoparticles
- have core-shell structures having a mean particle diameter of 0.05 to 2.0 μm and
- the crop protection agent is present in the core X-ray amorphous together with one or more polymers
- and the shell consists of a stabilizing coating matrix,
preparable by a process which comprises- (a) preparing a solution of the crop protection agent in a water-miscible organic solvent,
- (b) mixing the solution obtained in step (a) with the core polymer or a solution of the core polymer in a water-miscible organic solvent, where the polymer is not or only partially soluble in water or aqueous solutions or water/solvent mixtures, and
- (c) bringing the mixture resulting from (b) into contact with an aqueous solution comprising components of the coating matrix.
17 Citations
23 Claims
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1-12. -12. (canceled)
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13. An aqueous dispersion comprising a nanoparticulate formulation of crop protection agents in which the nanoparticles comprise one or more crop protection agents and one or more polymers in an X-ray amorphous core, and a coating shell structure wherein the nanoparticles have a mean particle diameter of 0.05 to 2.0 μ
- m and the shell consists of a stabilizing coating matrix,
wherein the nanoparticle formulation is prepared by a process comprising, (a) preparing a solution of the crop protection agent in a water-miscible organic solvent, (b) mixing the solution obtained in step (a) with the core polymer or a solution of the core polymer in a water-miscible organic solvent, where the polymer is not or only partially soluble in water or aqueous solutions or water/solvent mixtures, the polymer being a polyphenoxyethyl acrylate, polymethyl methacrylate, polystyrene and methyl methacrylate/styrene copolymer, and the term polymer embracing both homo- and copolymers; (c) bringing the mixture resulting from (b) into contact with an aqueous solution comprising components of the coating matrix, which are selected from the group consisting of polyethylene glycol, polypropylene glycol, polyethylene glycol/polypropylene glycol block copolymers, polyethylene glycol alkyl ethers, polypropylene glycol alkyl ethers, polyethylene glycol/polypropylene glycol ether block copolymers, polyvinyl alcohol, polyvinylpyrrolidone, polyvinylcaprolactam, polyacrylamidomethylpropylsulfonic acid, polycarboxylates, copolymers based on the monomers of these polymers, polyoxyethylene glycerol triricinoleate, condensates of sulfonated naphthalenes or phenols with formaldehyde and urea. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
- m and the shell consists of a stabilizing coating matrix,
Specification