Patent ID: 8110646

Claim:
A process for preparing a triorganosiloxy end-capped organopolysiloxane, comprising the steps of: copolymerizing tris(3,3,3-trifluoropropyl)trimethyl-cyclotrisiloxane which is a cyclic trimer of the formula (1): with an organosilane or organopolysiloxane of the general formula (2): wherein p is an integer of 4 to 100, in the presence of an alkyllithium catalyst or lithium silanolate catalyst to form a copolymer capped with a silanol group at an end of its molecular chain, adding a mixed solution of a trialkylsilyl triflate in excess relative to said catalyst and a hexaorganodisilazane or a mixed solution of a strong acid in excess relative to said catalyst and a hexaorganodisilazane to the reaction product for thereby capping the silanol group at the molecular chain end with a triorganosiloxy group and simultaneously effecting neutralization by deactivation of said catalyst, and heating the reaction product in vacuum to remove any vulcanization inhibitors, thus recovering an organopolysiloxane having the general formula (3): wherein R 1 is a substituted or unsubstituted monovalent hydrocarbon group of 1 to 8 carbon atoms, each of R 2 to R 6 is a substituted or unsubstituted, aliphatic unsaturation-free, monovalent hydrocarbon group of 1 to 8 carbon atoms, m is an integer of 0 to 100, and n is an integer of 1 to 1,000.