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Process for preparing hydrophobic particulate solids containing Si-OH groups and a process for using the same

  • US 5,057,151 A
  • Filed: 11/24/1989
  • Issued: 10/15/1991
  • Est. Priority Date: 11/25/1988
  • Status: Expired due to Term
First Claim
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1. A process for rendering a particulate solid containing Si-OH groups hydrophobic which comprises reacting a water repellent containing an organosilicon compound with the particulate solid containing Si-OH groups with simultaneous mechanical loading of the reaction mixture, in which from 5 to 50 percent by weight of the particulate solid containing Si-OH groups are used, based on the total weight of the reaction mixture containing particulate solid and water repellent, and wherein the water repellent contains from 1 to 5 percent by weight of water based on the weight of the water repellent.

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