| abstract |
Partial hydrophobic precipitated silicic acids, characterized by a humidity of 10 to 49% methanol, especially with an absorption of water-free DBP greater than 250 g / 100g and with an average particle size of 1 to 12 um and / or carbon content of 0.3 to 1.85% and / or a loss of dryness of 2.6 to 10.0% and / or a pH value of 5.5 to 10.0, made by mixing the agent Hydrophobic with the suspension of the silicic acid precipitated during a very short treatment time and at a low pH value, the solid substance is filtered, washed until it is desalinated, dried, then it is thermally treated and ground. The partial hydrophobic precipitated silicic acid can be introduced into active substance formulations as well as active substance formulations of hydrolytically sensitive substances and antifoams. |