B - Operations – Transporting – 01 – J
Patent
B - Operations, Transporting
01
J
117/46, 71/47
B01J 13/02 (2006.01) A01N 25/28 (2006.01) B01J 13/16 (2006.01)
Patent
CA 1180608
- 1 - Abstract: Pressure-resistant microcapsules with a polyamide shell and a polyurethane-polyurea structured inner mass, a process for their manufacture, and their use Pressure-resistant microcapsules with a shell comprising polyamide and polyurethane-polyurea structured inner mass which contains a water-immiscible liquid phase and, if desired, active compounds, preferably pesticidal active compounds. Furthermore, a process for the manu- facture thereof in an aqueous dispersion by dispersing a liquid water-immiscible phase which contains, in an organic solvent, the difunctional or polyfunctional acid derivative required for polyamide formation, a diiso- cyanate or polyisocyanate or mixture thereof with organic compounds containing hydroxyl groups, or adiisocyanate prepolymer or polyisocyanate prepolymer, and an inert organic aprotic hydrophilizing agent which can dissolve water, as well as the active compounds optionally to be encapsulated, in an aqueous solution of a protective colloid, which contains, if appropriate, surface-active agents, and simultaneously or subsequently admixing aqueous solutions of a diamine or polyamine and acid- binding agents, and reacting the components in the dis- persion and, if desired, isolating the microcapsules, preferably by spray-drying, and the use of the micro- capsules, preferably in plant protection.
378702
Albrecht Konrad
Frensch Heinz
Heinrich Rudolf
Fetherstonhaugh & Co.
Hoechst Aktiengesellschaft
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