Patent ID: 7368588

Claim:
A method for preparing a sulfide chain-bearing compound having the average compositional formula (2): (R 1 O) (3-p) (R 2 ) p Si—R 3 —S m —R 3 —Si(OR 1 ) (3-p) (R 2 ) p (2) wherein R 1 and R 2 each are a monovalent hydrocarbon group of 1 to 4 carbon atoms, R 3 is a divalent hydrocarbon group of 1 to 10 carbon atoms, m has an average value of 2≦m≦6, and p is 0, 1 or 2, the method comprising the sequential steps of first, reacting a mixture of a halogenoalkyl group-bearing organosilicon compound having the general formula (1): (R 1 O) (3-p) (R 2 ) p Si—R 3 —X (1) wherein R 1 and R 2 each are a monovalent hydrocarbon group of 1 to 4 carbon atoms, R 3 is a divalent hydrocarbon group of 1 to 10 carbon atoms, X is a halogen atom, and p is 0, 1 or 2, and sulfur to form an intermediate reaction product, and then, reacting the intermediate reaction product with an aqueous solution or water dispersion of a sulfide having the formula M 2 S wherein M is ammonium or an alkali metal or a hydrate thereof in the presence of a phase transfer catalyst.