Patent ID: 8642690

Claim:
A method of manufacturing a bis[tri(hydroxypolyalkyleneoxy)silylalkyl] polysulfide represented by general formula (1): [H (OR 1 ) n O] 3 SiRS x RSi[O(R 1 O) n H] 3 (1) where R is an alkylene group having 1 to 6 carbon atoms; R 1 is an alkylene group having 2 to 4 carbon atoms; “n” is 2 or 3; and “x” is an integer from 2 to 8, by heating a bis[trialkoxysilylalkyl] polysulfide of general formula (2): (R 2 O) 3 SiRS x RSi (OR 2 ) 3 (2) where R 2 is an alkyl group having 1 to 6 carbon atoms, and R and “x” are the same as defined above, together with a polyalkyleneglycol of general formula (3): H(OR 1 ) n OH (3) where R 1 and “n” are the same as defined above, in the presence of an alkali metal alcoholate, thus substituting alkoxy groups represented by formula (4): —OR 2 in the bis[trialkoxysilylalkyl]polysulfide of formula (2) with hydroxypolyalkyleneoxy groups represented by general formula (5): —O(R 1 O) n H where R 2 , R 1 , and “n” are the same as defined above.