Pyrogenic silica and dispersion thereof

摘要

The pyrogenically produced silicon dioxide powder has BET surface area of 90+-15 m2>/g, and exists in the form of aggregates of primary particles. The aggregate has average surface area of 10000-20000 nm2>, average equivalent circle diameter of 90-130 nm, and average circumference of 1000-1400 nm. Independent claims are included for the following: (1) production of silicon dioxide powder; (2) a method of using the pyrogenically produced silicon dioxide powder, comprising mixing the powder with rubber, silicone rubber, plastics, paints or coatings; (3) an aqueous dispersion containing the pyrogenically produced silicon dioxide powder; and (4) process of using aqueous dispersion.