Patent ID: 8835564

Claim:
A method for producing a modified conjugated diene-based polymer, the method comprising: a step of reacting a conjugated diene-based polymer having monomer units derived from a conjugated diene compound, monomer units derived from a compound represented by Formula (1) and monomer units derived from a compound represented by Formula (2), with an organometallic compound, and a step of reacting the resulting product and an epoxy compound, wherein the conjugated diene-based polymer comprises the monomer units derived from the compound represented by Formula (1) in a content of from 0.01% by weight to 1% by weight where the total amount of all the monomer units contained in the conjugated diene-based polymer is taken as 100% by weight; wherein R 11 , R 12 , R 13 , R 14 and R 15 each independently represent a hydrogen atom or an alkyl group; at least one group selected from R 11 , R 12 , R 13 , R 14 and R 15 is an alkyl group; R 16 R 17 and R 18 each independently represent a hydrogen atom or a hydrocarbyl group; R 19 represents a hydrocarbylene group; k is 0 or 1, wherein the compound represented by Formula (2) consists of carbon atoms and hydrogen atoms; R 20 , R 21 , R 22 , R 23 and R 24 are all hydrogen atoms or two or more groups selected from R 20 , R 21 , R 22 , R 23 and R 24 are linked to form one or more rings consisting of carbon atoms including the carbon atoms to which the groups are attached and each of the rest of R 20 , R 21 , R 22 , R 23 and R 24 is a hydrogen atom; R 25 , R 26 and R 27 each independently represent a hydrogen atom or a hydrocarbyl group.