hydrating agent such as magnesium sulfate and calcium carbonate or an irreversible dehydrating agent such...http://www.google.com/patents/US5130399?utm_source=gb-gplus-sharePatent US5130399 - Using a basic catalysi and a dehydrating agent for producing polysiloxanesAdvanced Patent SearchPublication numberUS5130399 APublication typeGrantApplication numberUS 07/702,299Publication dateJul 14, 1992Fil