Method for making substantially silanol-free silicone resin powder, product and use

摘要

A method for making a substantially silanol-free silicone resin powder having a primary particle size in the range of about 0.1-200 nm and an aggregate particle size of 10 nm to 200 microns is provided. An organic solvent dispersion of an organosiloxane hydrolyzate having triorganosiloxy units and tetrasiloxy units is treated with an organo nitrogen compound, such as a silazane and thereafter spray dried. The substantially silanol-free organosilicon powder has been found useful in making heat curable organopolysiloxane compositions, such as pressure sensitive adhesives.