Low compression set fluorosilicone rubber.

摘要

A fluorosilicone rubber with low compression set and other physical properties which either are not significantly effected or are improved is made by curing a composition of a polydiorganosiloxane having 3,3,3-trifluoropropylsiloxane units and endblocked with vinyl or silacyclopentenyl groups, a reinforcing silica having dimethyl(3,3,3-trifluoropropyl)siloxy units as the surface treatment and a vinyl specific organic peroxide. The polydiorganosiloxane endblocking is done by reacting a silanol endblocked polymer with a silazane.