HOLLOW MICROSPHERES WITH ORGANOSILICON-SILICATE SURFACES

摘要

Hollow microspheres of reduced surface energy and reactivity are prepared by simultaneously forming said microspheres and reacting them with an organosilicon compound. The microspheres are prepared by spray drying a solution of alkali metal silicate and a "polysalt." The organosilicon is present as the microspheres are formed and react to form the surfaces of the spheres. The resulting product is more discrete, more free-flowing, has better packaging characteristics, improved packing factor and improved filler properties when compared to prior-art microspheres.