BASE-TRIGGERED RELEASE MICROCAPSULES

摘要

Microcapsules formed from an aminoplast shell wall and an encapsulated ingredient or ingredients enclosed within the wall in which the wall contain s a base-cleavable ester moiety. These capsules have been found to be sensitiv e to the presence of base such that in the presence of base, the capsule walls are relatively quickly disintegrated or degraded so as to produce a relative ly quick release of the encapsulated materials. Microcapsules of this invention are particularly suitable for use in controlling insects having an alkaline gut such as certain lepidoptera in that the capsule shell wall may be design ed so as to quickly disintegrate under the alkaline conditions present in the g ut of the insect thus providing a microcapsule which is safe to handle but whic h is selectively effective against certain undesirable insects while not harmf ul to beneficial insects or insects which do not feed on the capsule materials.