Patent ID: 7288667

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 Si—R 3 —S—(R 4 —S m ) q —R 4 —S—R 3 —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 halogen-terminated organosilicon compound having the general formula (1): (R 1 O) (3-p) (R 2 ) p Si—R 3 —S—R 4 —X (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, sulfur, and optionally a halogen-containing compound having the general formula (2): X—R 4 —X (2) wherein R 4 is a divalent hydrocarbon group of 1 to 10 carbon atoms and X is a halogen atom, with an aqueous solution or dispersion of a sulfide having the formula (3): M 2 S (3) wherein M is ammonium or an alkali metal or a hydrate thereof in the presence of a phase transfer catalyst.