Auto-adhering one-component RTV silicone sealant composition utilizing an adhesion promoter

Claim 1

A room temperature vulcanizable silicone rubber composition comprising: from about 25 to 90 percent by weight based upon the total weight of the composition of a devolatilized silanol terminated diorgano-siloxane base polymer having a viscosity from about 2,000 to about 250,000 centipoises at 25° C. wherein said organo groups are the same or different and are selected from the group consisting of an alkyl having from 1 to 8 carbon atoms, a cycloalkyl having from 4 to 7 carbon atoms, an alkenyl having from 2 to 8 carbon atoms, an aryl or an alkyl substituted aryl having from 6 to 14 carbon atoms, and a fluoroalkyl having from 1 to 8 carbon atoms; from about 0 to about 40 percent by weight based upon the total weight of said composition of a devolatilized diorganopolysiloxane fluid plasticizer terminated with triorganosiloxy groups, said organo groups selected from the group consisting of alkyl having 1 to 8 carbon atoms, cycloalkyl having 4 to 7 carbon atoms, alkenyl having 2 to 8 carbon atoms, aryl or alkyl substituted aryl having 6 to 14 carbon atoms and fluoroalkyl having 1 to 8 carbon atoms said plasticizer having a viscosity from about 50 to about 100,000 centipoises at 25° C.; and 0.5 to 3 percent by weight of an adhesion promoter of the formula: ##STR7## wherein R 1 and R 6 are independently non-aromatic hydrocarbyl or halohydrocarbyl groups or carboxyalkyl groups having 1 to 10 carbon atoms; R 2 , R 3 , R 7 and R 8 are independently H, hydrocarbyl, halohydrocarbyl or carboxyalkyl having 1 to 10 carbon atoms; R 4 and R 5 are divalent hydrocarbyl or halohydrocarbyl groups of 1 to 10 carbon atoms; a and e are 0 to 2; b and f are 1 to 3; q and h are 0 or 1 and a+b+g=f+e+h=3.