Ciba-geigy Corporation

Novartis Corporation

Hans Walter Hasslin

Michael J Hopkinson

Bruno Wieland

Hessel J Schuurman

Jean-Francois Graf

Theodor Steiner

The invention relates to a process for the preparation of an aqueous suspension of microcapsules having a capsule wall of polyurea and encapsulating a water-immiscible pesticide, by dispersing a solution of a polyisocyanate in the sparingly water-soluble pesticide in water and subsequently reacting the dispersion with a polyamine, which process comprises effecting the dispersion of the solution of the polyisocyanate in the sparingly water-soluble pesticide in water and the subsequent reaction of the dispersion with the polyamine in the presence of at least one water-soluble or water-dispersible nonionic surfactant of a block copolymer having at least one hydrophobic block and at least one hydrophilic block.

Process for the preparation of microcapsules

Aqueous emulsions are described comprising an organic phase of a substantially hydrophobic pesticide or mixture of pesticides which are liquid or dissolved in a hydrophobic solvent, and an aqueous phase comprising surfactants and/or dispersants, wherein

Storage stable pesticidal aqueous emulsions

The invention relates to a process for the preparation of microcapsules having a capsule wall of polyurea and encapsulating a water-immiscible pesticide. The process comprises first dispersing a solution of a polyisocyanate in the sparingly water-soluble pesticide, in the presence of an anionic dispersant and at least one nonionic protective colloid and/or a nonionic surfactant, and subsequently reacting the dispersion with a polyamine, to give a stable aqueous suspension of microcapsules which can be used either direct or after dilution with water as pesticidal composition.

The present invention relates to a method of controlling ectoparasites in domestic animals employing used treatment liquid, in which method animals are passed through animal dips/spray races in which there is an aqueous dispersion of a microencapsulated ectoparasiticide, thus achieving a uniform distribution of the active ingredient between the animals.

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Grenzach-Wyhlen, Germany

Hans Walter Hasslin