Anionic silicone surfactant and method of its manufacture

摘要

An anionic silicone surfactant, with excellent surface tension lowering properties in aqueous and solvent systems, of the general formula wherein each R1 is an unsubstituted or halogen-substituted monovalent hydrocarbon group of 1-20 carbon atoms or a trialkylsiloxy group of 1-20 carbon atoms; R2 is an unsubstituted, halogen-substituted or hydroxyl-substituted bivalent hydrocarbon group of 1-10 carbon atoms, or a corresponding hydrocarbon group wherein no more than half of the carbon atoms are replaced by an oxygen atom; M is a Group A alkali metal or NR3R4R5 wherein R3, R4 and R5 are a hydrogen atom or a monovalent hydrocarbon group of 1-20 carbon atoms; and a is a number which lies in the range 0 in the presence of a platinum catalyst, and reacting the thus-produced epoxy group-terminated organopolysiloxane with sodium or potassium bisulfite.