| 摘要 |
Polyurea microcapsules having individual capsule walls are produced. The capsule walls are obtained by interfacial polymerisation. Firstly, an organic phase is formed, which contains water-immiscible material to be encapsulated, a solvent which is capable of excluding water from the organic material and/or of controlling the porosity of the polyurea wall in accordance with the solubility parameter for the polyurea microcapsule wall, and a polyisocyanate. This organic phase is dispersed in an aqueous phase which, in addition to water, contains a surfactant and a protective colloid. The individual polymer walls of the capsules are then formed. This process allows the quality, in particular the porosity and thus the permeability of the capsule walls to be controlled. |
