Low water uptake precipitated silica particulates
AssigneeRhone-Poulenc Chimie
InventorsJacques Billion, Yvonick Chevallier, Jean-Claude Morawski
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Abstract
Novel precipitated silica particulates having low water uptake and high BET and CTAB surfaces, well adapted as reinforcing fillers for, e.g., the silicones, are conveniently prepared by heat treating certain starting material precipitated silica particulates at a temperature of at least 700.degree. C., for at least one minute.
Claims17
Heat treated precipitated silica particulates having a BET surface area of from 100 to 350 m.sup.2 /g and a CTAB surface area of from 100 to 350 m.sup.2 /g the water uptake of said particulates, without treatment with a hydrophobization agent, being no greater than about 4.5%.
Dependencies are inferred from the claim text.