MODIFIED RELEASE AGROCHEMICAL COMPOSITION AND A PROCESS FOR PREPARING THE SAME

摘要

The present disclosure relates to a modified release agrochemical composition and a process for preparing the same. The composition comprises cores of one or more active ingredient coated with at least one layer of hydrophobic material as a preliminary coat which is further coated with at least one layer of polyurethane based polymeric material. The layer of polyurethane is formed by in-situ polymerization of polyol and isocyanate compounds during the coating operation.

主权项

1. A process for preparing a modified release composition, said process comprising the following steps:
i. providing cores consisting of granules of at least one active ingredient, said granules having size in the range of 1 mm to 20 mm; said active ingredients being selected from a group consisting of pesticides, fertilizers and herbicides ii. coating said cores with at least one hydrophobic material having melting point in the range of 60° C. to 100° C. to obtain coated cores; iii. forming a polymer coat on said cores by in situ polymerization of at least one polyol and at least one isocyanate in the presence of at least one catalyst to obtain polymer coated cores; and iv. curing the polymer coated cores at a temperature ranging between 95° C. and 100° C. for a time period ranging between 10 and 20 minute to obtain a modified release composition.