Microcapsule formulations
The invention relates to novel microcapsule formulations of (A) a particulate disperse phase of microcapsules comprising (1) a polyurea and/or polyurethane coating with average layer thicknesses of between 5 and 20 nm, and (2) a capsule filling comprising at least one penetrant and, optionally, additives, and (B) a suspension comprising (1) at least one solid agrochemical active compound, (2) additives, (3) water, and (4) optionally, one or more agrochemical active compounds that are liquid at room temperature. The invention further relates to a process for the preparation of these microcapsule formulations and to their use for applying agrochemical active compounds.
1. A agrochemical formulation comprising
(A) a particulate disperse phase of microcapsules having
(1) a polyurea and/or polyurethane coating having an average layer thickness of between 5 and 20 nm, and
(2) a capsule filling comprising at least one penetrant and, optionally, additives,
and
(B) a suspension present on the exterior surface of said coating comprising
(1) at least one solid agrochemical active compound,
(2) additives,
(3) water, and
(4) optionally, one or more agrochemical active compounds that are liquid at room temperature.
2. A process for the preparation of agrochemical formulations according to claim 1 comprising
(a) in a first step, dispersing a mixture of
(1) at least one penetrant,
(2) at least one polyisocyanate selected from the group consisting of aliphatic isocyanates, aromatic isocyanates, cycloaliphatic isocyanates, and the isocyanate of the formula
(3) optionally, additives
in an aqueous phase comprising
(1) one or more protective colloids,
(2) water, and
(3) optionally, one or more emulsifiers,
(b) in a second step, adding to the mixture formed in step (a) at least one diamine, polyamine, dialcohol, polyalcohol, and/or aminoalcohol, and
(c) in a third step, after optionally freeing the microcapsule dispersion obtained in step (b) from all or a portion of the liquid phase, stirring the microcapsule dispersion with a suspension comprising
(1) at least one solid agrochemical active compound,
(2) additives, and
(3) optionally, one or more agrochemical active compounds that are liquid at room temperature.
3. A method of applying an agrochemical active compound to plants comprising applying a agrochemical formulation according to claim 1 to plants and/or their environment.
4. A microcapsule preparation comprising microcapsules having
(1) a polyurea and/or polyurethane coating having an average layer thickness of between 5 and 20 nm, and
(2) a capsule filling comprising at least one penetrant and, optionally, additives, optionally as a mixture with one or more diluents and/or additives, and optionally,
(3) a suspension present on the exterior surface of said coating comprising
(a) at least one solid agrochemical active compound,
(b) additives, and
(c) water,
(d) where optionally, one or more of said agrochemical active compounds are liquid at room temperature.
5. A method of improving the efficacy of plant treatment compositions comprising incorporating the plant treatment composition into a microcapsule preparation according to claim 4 .