Time-release delivery matrix composition and corresponding controlled-release compositions

摘要

A composition is provided for use as a matrix for controlled-release compositions. Such compositions utilize an active ingredient dispersed in a matrix. Active ingredients include, for example, pharmaceuticals and agricultural agents. The matrix is a blend of a poly(hydroxyethyl) methacrylate, polyethylene glycol and a time-release extending agent which is a low molecular weight polymer having hydrophilic and hydrophobic side groups, such as diblock or triblock poly(ethylene oxide propyleneoxide).