Colloidal size hydrophobic polymer particulate having discrete particles of a metal dispersed therein

摘要

Colloidal size particles of a non-oxidized metal (e.g., iron or silver) are encapsulated in a hydrophobic polymer (e.g., a copolymer of styrene and butylacrylate) by a polymerization process wherein a water-immiscible monomer is dispersed in an aqueous colloidal dispersion of preformed metal particles and subjected to conditions of emulsion polymerization. The resulting encapsulated non-oxidized metal particles are usefully employed as electrically resistive barriers, toners, electroconductive additives and as pressure sensors.