PROCESS FOR RENDERING HYDROPHOBIC A PARTICULATE SOLID CONTAINING SI-OH GROUPS AND THE USE OF THE RESULTING HYDROPHOBIC PARTICULATE SOLID IN A PROCESS FOR PREPARING COMPOSITIONS, BASED ON DIORGANOPOLYSILOXANES, WHICH CAN BE CURED TO FORM ELASTOMERS

摘要

The invention relates to a process for rendering particulate solids containing Si-OH groups hydrophobic which comprises reacting a water repellent containing an organo-silicon compound with particulate solids containing Si-OH groups with simultaneous mechanical loading of the reaction mixture, in which from 5 to 50 percent by weight of the particulate solids containing Si-OH groups are used, based on the total weight of the reaction mixture containing particulate solids and water repellent, and the use of the resultant hydrophobic particulate solids in compositions containing diorganopolysiloxanes, which can be cured to form elastomers.