| abstract |
PROBLEM TO BE SOLVED: To provide a partially hydrophobic precipitated silica by mixing a hydrophobizing agent and a precipitated silica suspension with a short residence time and a low pH value, and separating a solid by filtration. , 10-49% methanol wettability, DBP-absorptive (absolute) greater than 250 g / 100 g or average grain size of 1-12 μm, prepared by washing until salt free, drying, heat treating and grinding Diameter and / or 0.3-1. Partially hydrophobic precipitated silica having a carbon content of 85% and / or a loss on drying of 2.6 to 10.0% and / or a pH value of 5.5 to 10.0. This partially hydrophobic precipitated silica can be used in active substance formulations, in active substance formulations of substances sensitive to hydrolysis, and in antifoams. |