HYDROGEL MICROBEADS HAVING A SECONDARY LAYER

摘要

A microbead having a matrix core comprising a hydrophilic matrix and droplet s of active material entrained therein, and a secondary layer adjacent to the outer surface of the matrix core. The secondary layer may be ionically complexed or hydrogen bonded to the matrix core surface. Compositions comprising the microbeads suspended in solution may be sprayable. The microbeads of the invention may be controllable by exposing the microbeads t o high or low humidity or moisture.