| 摘要 |
A process for microencapsulating a core material and subsequently releasing the core material by selectively disrupting the membranes of the microcapsules involves the formation of a water-insoluble semipermeable membrane, e.g., around a droplet, through formation of multiple ionic salt bonds between a polyionic polymer in the droplet and a crosslinking polyionic polymer which possesses multiple ionic groups of opposite charge. The membrane is disrupted by exposing it to a solution of competing crosslinking multivalent (preferably di or trivalent) ions and to a solution of a competing polyionic polymer of the same charge as the polymer in the original droplet. The two competing reagents may be used in admixture. The competing reagents convert the membranes into a water-dispersible or soluble gel from which is then completely disrupted by exposure to a sequestering agent. |
