Aqueous suspension of nanoparticles comprising an agrochemical active ingredient
First Claim
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1. An aqueous suspension of nanoparticles, said nanoparticles having a solid core comprising:
- an amphiphilic compound comprising at least one hydrophilic moiety and at least one hydrophobic moiety, and at least 50 parts by weight of an organic water-insoluble agrochemical active ingredient for 100 parts of the amphiphilic compound, wherein more than 50% of the nanoparticles have a diameter of lower than 1060 nm.
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Abstract
The invention relates to an aqueous suspension of particles, said particles comprising an organic active ingredient. A controlled release of the ingredient occurs. The invention is especially suitable for the controlled release of organic agrochemical active ingredients useful in crop sciences, such as pesticides.
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Citations
24 Claims
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1. An aqueous suspension of nanoparticles, said nanoparticles having a solid core comprising:
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an amphiphilic compound comprising at least one hydrophilic moiety and at least one hydrophobic moiety, and at least 50 parts by weight of an organic water-insoluble agrochemical active ingredient for 100 parts of the amphiphilic compound, wherein more than 50% of the nanoparticles have a diameter of lower than 1060 nm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
the amphiphilic compound has a number-average molecular weight comprised between 1000 and 50000 g/mol, the hydrophobic block(s) has a glass transition temperature lower than 30°
C.
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13. An aqueous composition according to claim 11, wherein the amphiphilic compound is a di-block copolymer comprising a hydrophilic block and a hydrophobic block.
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14. An aqueous composition according to claim 13, wherein the di-block copolymer is obtained by a “
- living”
polymerization process with the use of a transfer agent, comprising the steps of;a) reacting an ethylenically unsaturated hydrophobic or hydrophilic monomer, at least a free radicals source compound, and a transfer agent, to obtain a first block, b) reacting the first block, an ethylenically unsaturated hydrophobic or hydrophilic monomer, and, optionally, at least a radical source compound, to obtain a di-block copolymer, and then, c) optionally, reacting the transfer agent with means to render it inactive.
- living”
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15. An aqueous suspension according to claim 14, wherein the transfer agent comprises a dithioester group, a thioester-thione group, a dithiocarbamate group, or a xanthate group.
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16. An aqueous suspension according to claim 11, wherein the hydrophilic block comprises units deriving from monomers being:
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unsaturated ethylenic monocarboxylic acids, unsaturated ethylenic dicarboxylic acids, monoalkyl esters of unsaturated ethylenic dicarboxylic acids or N-substituted derivatives of monoalkyl esters of unsaturated ethylenic dicarboxylic, amides of unsaturated carboxylic acids, ethylenic monomers comprising a sulphonic acid group, their alkali metal or their ammonium salts.
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17. An aqueous suspension according to claim 16, wherein the hydrophilic block comprises units deriving from monomers being acrylic acid (AA), methacrylic acid, itaconic acid, maleic acid, fumaric acid, 2-hydroxyethyl acrylate, 2-hydroxyethyl acrylate methacrylate, acrylamide (AM), methacrylamide, vinylsulphonic acid, vinylbenzenesulphonic acid, alpha-acrylamidomethylpropanesulphonic acid, 2-sulphoethyl methacrylate, 2-acrylamido-2-methylpropanesulphonic acid (AMPS), or styrenesulphonate (SS).
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18. An aqueous suspension according to claim 11, wherein the hydrophobic block comprises units deriving from monomers being:
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esters of acrylic acid and of methacrylic acid with hydrogenated or fluorinated C1-C12 alcohols, vinyl nitrites having from 3 to 12 carbon atoms, carboxylic acid vinyl esters, vinyl halides, vinylamine amides, unsaturated ethylenic monomers comprising a secondary, tertiary or quaternary amino group, unsaturated ethylenic monomers comprising a heterocyclic group comprising nitrogen, or styrene.
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19. An aqueous suspension according to claim 18, wherein the hydrophobic block comprises units deriving from monomers being methyl acrylate, ethyl acrylate, propyl acrylate, n-butyl acrylate, isobutyl acrylate, 2-ethylhexyl acrylate, t-butyl acrylate, methyl methacrylate, ethyl methacrylate, n-butyl methacrylate, isobutyl methacrylate, acrylonitrile, methacrylonitrile, vinyl acetate, vinyl versatate, vinyl propionate vinylformamide, vinylacetamide, vinylpyridines, vinylimidazole, aminoalkyl (meth)acrylates, aminoalkyl(meth)acrylamides, dimethylaminoethyl acrylate, dimethylaminoethyl methacrylate, di-tert-butylaminoethyl acrylate, di-tert-butylaminoethyl methacrylate, dimethylaminomethylacrylamide or dimethylaminomethylacrylamide methacrylamide.
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20. An aqueous suspension according to claim 11, wherein the hydrophobic block is a polybutylacrylate block, and the hydrophilic block is a polyacrylic acid block.
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21. An aqueous suspension according to claim 20, wherein the ratio between the weight-average molecular weight of the hydrophilic block and the weight-average molecular weight of the hydrophobic block is from 1 to 5.
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22. An aqueous suspension according to claim 21, wherein the weight-average molecular weight of the hydrophobic block is comprised between 1000 g/mol and 10000 g/mol, and the weight-average molecular weight of the hydrophilic block is comprised between 1000 g/mol and 50000 g/mol.
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23. An aqueous suspension according to claim 1, obtained by a process comprising mixing water, the organic water-insoluble agrochemical active ingredient dissolved a water-miscible solvent, and the amphiphilic compound.
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24. A process for protecting plants or for increasing crop yield, comprising the step of spreading an aqueous suspension according to claim 1.
Specification