| abstract |
THE PRESENT INVENTION IS RELATED TO THE PREPARATION OF PARTIALLY HYDROPHOBIC SILICY ACIDS THAT ARE CHARACTERIZED BY PRESENTING A HUMECTABILITY WITH METHANOL OF BETWEEN 10 AND 49%, ESPECIALLY WITH AN ANHYDRATED DBP ABSORPTION GREATER THAN 250 G / 100 GO WITH A TAN DE PARTICULA BETWEEN 1 AND 12 {MI} MY / O A CARBON CONTENT BETWEEN 0.3 AND 1.85% AND / OR A LOSS DUE TO DESICTION BETWEEN 2.6 AND 10.0% AND / OR A VALUE PH BETWEEN 5.5 AND 10.0. IN THE PREPARATION, THE AMOUNT OF HYDROPHOBIC AGENT IS MIXED WITH THE SUSPENSION OF PRECIPITATION SILICONE ACID FOR A SHORT TIME AND WITH A LOW PH VALUE, THE SOLID SUBSTANCE IS SEPARATED THROUGH FILTRATION, WASH WITHOUT SALT, AND DRIED THROUGH HEATING. THE PARTIALLY HYDROPHOBIC PRECIPITATION SILICON ACID MAY BE USED IN ACTIVE SUBSTANCE FORMULATIONS, IN ACTIVE SUBSTANCE FORMULATIONS OF HYDROLYSABLE SUBSTANCES AND IN ANTI-FOAMS. |