| abstract |
Microcapsules formed by an aminoplast shell and an encapsulated ingredient or ingredients inside a shell that contains an ester moiety that is cleaved by the base. It has been found that these capsules are sensitive to the presence of alkali, so that in the presence of a base, the capsule shell disintegrates or degrades relatively quickly and thus provides a relatively quick release of encapsulated materials. The microcapsules of the present invention are particularly suitable for use in controlling insects having an alkaline environment in the intestines, such as some lepidoptera, and the capsule shell can be designed to rapidly disintegrate in the alkaline environment present in the intestine of the pest, thereby providing microcapsules that safe to work with, but which have a selective effect against some unwanted harmful insects and remain safe for beneficial insects or insects, which did not absorb capsule materials. |