Oil resistant low modulus silicone sealant composition

摘要

The invention provides a vulcanizable silicone rubber composition comprising 25 to 90% of a devolatilized silanol/terminated diorgano-siloxane base polymer having a viscosity from 2,000 to 250,000 centipoises at 25°C;from 0 to 40% a devolatilized diorganopolysiloxane fluid plasticizer terminated with triorganosiloxy groups having a viscosity from 50 to 100,00 centipoises at 25°C;from 2 to 15% of an oxime crosslinking agent of the formulawhere y is 2.2 to 3, x is 0.8 to 1.0, and R₃, A and B are organo groups;from 0.01 to 0.5% of an organo tin catalyst; andfrom 5 to 60 percent by weight of a hydrophobic calcium carbonate filler.;The composition is a low modulus silicone rubber suitable as a low odor, one component, room temperature vulcanizable, formed-in-place gasketing sealant.