Described is a process for preparing extruded functional fluid and solid-containing thermoplastic foamed particles using chemical blowing agents or direct gas extrusion processes, uses of such foamed particles and articles produced from said foamed particles. The process described involves the use of...http://www.google.com/patents/US4521541?utm_source=gb-gplus-sharePatent US4521541 - Process for forming functional fluid and solid-containing thermoplastic films, uses thereof and process for producing same
