| 摘要 |
A process of encapsulating water-immiscible material within discrete capsules of polyurea without addition of a second reactant, whereby hydrolysis of an isocyanate monomer to form an amine takes place, which in turn reacts with another isocyanate monomer to form polyurea, which comprises the steps of (a) providing at room temperature, a dispersion of (i) a plurality of water-immiscible phases, each phase comprising the water-immiscible material to be encapsulated and at least one organic polyisocyanate in (ii) an aqueous phase comprising a solution of water, a surfactant and a protective colloid; and (b) heating and maintaining said dispersion in a temperature range of about 40 DEG C to about 90 DEG C, whereupon said water-immisicible material is encapsulated within discrete polyurea capsuler enclosures directly usable without further separation or purification. |
