Method for producing modified conjugated diene-based polymer, modified conjugated diene-based polymer, polymer composition, crosslinked body, tire and compound

2:

• The method according to claim 1, wherein the compound [M] is a compound of formula (1):
• wherein R2 and R3 are each independently a hydrocarbyl group having 1 to 20 carbon atoms,
• R4 is an alkanediyl group having 1 to 20 carbon atoms, and
• A2 is a group “*—C(R1)═N—” or a group “*—N═C(R1)—”, where R1 is a hydrogen atom or a hydrocarbyl group and “*” represent a bond to R5;
• R5 is an m-valent hydrocarbyl group having 1 to 20 carbon atoms or an m-valent group having 1 to 20 carbon atoms, which has at least one atom selected from the group consisting of a nitrogen atom, an oxygen atom, and a sulfur atom and does not have an active hydrogen;
• n is an integer of 1 to 3 and
• m is an integer of 2 to 10;
• and
• a plurality of R2, R3, R4, A2, and n are optionally the same or different.

8:

• A modified conjugated diene-based polymer of formula (3):
• wherein R2 is a hydrocarbyl group having 1 to 20 carbon atoms, R6 is a hydrocarbyloxy group having 1 to 20 carbon atoms or a modified or unmodified conjugated diene-based polymer chain, R4 is an alkanediyl group having 1 to 20 carbon atoms, and Z is a group represented by the following formula (4) or (5);
• R5 is an m-valent hydrocarbyl group having 1 to 20 carbon atoms or an m-valent group having 1 to 20 carbon atoms, which has at least one atom selected from the group consisting of a nitrogen atom, an oxygen atom, and a sulfur atom and does not have an active hydrogen;
• n is an integer of 1 to 3 and m is an integer of 2 to 10;
• and a plurality of R2, R4, R6, Z, and n are optionally the same or different:
• wherein R1 is a hydrogen atom or a hydrocarbyl group and Poly is a modified or unmodified conjugated diene-based polymer chain;
• and “*” represents a bond to R5.

9:

• A polymer composition, comprising:
• a modified conjugated diene-based polymer obtained by the method according to claim 1,
• silica, and
• a crosslinking agent.

12:

• A compound of formula (1):
• wherein R2 and R3 are each independently a hydrocarbyl group having 1 to 20 carbon atoms, R4 is an alkanediyl group having 1 to 20 carbon atoms, A2 is a group “*—C(R1)═N—” or a group “*—N═C(R1)—” where R1 is a hydrogen atom or a hydrocarbyl group and “*” represents a bond to be bound to R5;
• R5 is an m-valent hydrocarbyl group having 1 to 20 carbon atoms or an m-valent group having 1 to 20 carbon atoms, which has at least one atom selected from the group consisting of a nitrogen atom, an oxygen atom, and a sulfur atom and does not have an active hydrogen;
• n is an integer of 1 to 3 and m is an integer of 2 to 10;
• and a plurality of R2, R3, R4, A2, and n are optionally the same or different.

13:

• A polymer composition, comprising:
• the modified conjugated diene-based polymer according to claim 7,
• silica, and
• a crosslinking agent.

16:

• A polymer composition, comprising:
• the modified conjugated diene-based polymer according to claim 8,
• silica, and
• a crosslinking agent.