Patent ID: 7355059

Claim:
A method for preparing a sulfide chain-bearing organosilicon compound having the average compositional formula (4): (R 1 O) (3-p) (R 2 ) p Siâ€”R 3 â€”Sâ€”(R 4 â€”S m ) q â€”R 4 â€”Sâ€”R 3 â€”Si(OR 1 ) (3-p) (R 2 ) p (4) wherein R 1 and R 2 each are a monovalent hydrocarbon group of 1 to 4 carbon atoms, R 3 and R 4 each are a divalent hydrocarbon group of 1 to 10 carbon atoms, m is a positive number having an average value of 2 to 6, p is 0, 1 or 2, and q is 1, 2 or 3, the method comprising the step of reacting: (a) a halogen-terminated organosilicon compound having the general formula (1): (R 1 O) (3-p) (R 2 ) p Siâ€”R 3 â€”Sâ€”R 4 â€”Xâ€ƒâ€ƒ(1) wherein R 1 and R 2 each are a monovalent hydrocarbon group of 1 to 4 carbon atoms, R 3 and R 4 each are a divalent hydrocarbon group of 1 to 10 carbon atoms, X is a halogen atom, and p is 0, 1 or 2, and optionally (b) a halogen-containing compound having the general formula (2): Xâ€”R 4 â€”Xâ€ƒâ€ƒ(2) wherein R 4 is a divalent hydrocarbon group of 1 to 10 carbon atoms and X is a halogen atom, and/or (c) sulfur with (d) an aqueous solution or dispersion of a polysulfide having the formula (3): M 2 S n (3) wherein M is ammonium or an alkali metal and n is a positive number having an average value of 2 to 6 or a hydrate thereof in the presence of (e) a phase transfer catalyst.