Sustained release silica microcapsules

摘要

The present invention relates to a microcapsule exhibiting desirable sustained-release properties, which microcapsule comprises a core material comprising an active ingredient encapsulated within a silica shell, characterized in that the outer surface of such silica shell has a layer of a metal selected from Group 2a, Group 8, Group 2b or Group 3a of the Periodic Table bound thereto. In other aspects this invention relates to a method of making such a microcapsule; a pesticidal composition comprising microcapsules comprising a pesticidal active ingredient and a suitable carrier; and to a method of controlling pests comprising applying an effective amount of such a pesticidal composition to a locus where pests are or are expected to be present.

主权项

1. A microcapsule comprising a core material comprising an active ingredient encapsulated within a silica shell; said silica shell being modified by post-treatment with an inorganic metal salt or acid selected from Group 2a, Group 8, Group 2b and Group 3a metal salt and acid thereof wherein the outer surface of said silica shell has bound thereto a layer consisting of a metal selected from the group consisting of Group 2a, Group 8, Group 2b, and Group 3a metals.