| 摘要 |
Microcapsules are prepared en masse which contain a substantially water-insoluble core and, incorporated at their surface under a thin film of hydrophilic polymeric colloid, a substantially water insoluble finely divided additive. In the preparation, a primary microcapsule is made in an aqueous vehicle to surround the water-insoluble core, the finely divided additive is then added under stirring to form a fine dispersion and cationic hydrophilic polymeric colloid solution is added to cause the colloid to envelop the additive and deposit it on the capsule wall under a thin film. |
