Method of making a pumpable, stable polydiorganosiloxane-silica foundation mixture and room temperature curing sealant

摘要

A process of making a pumpable, stable, polydiorganosiloxane-silica foundation mixture by mixing and heating a polydiorganosiloxane, a reinforcing silica filler, and a diol surface modifying agent at >50 DEG C. to <180 DEG C. using 0.05 to 0.5 parts by weight of the diol per one part by weight of the silica. The foundation mixture can be used to make RTV silicone sealant compositions which are non-sag.