MODIFIED POLYMER BASED ON CONJUGATED DIENE, METHOD OF ITS PRODUCTION AND RUBBER COMPOSITION CONTAINING IT Russian patent published in 2024 - IPC C08F236/04 C08F236/10 C08F236/14 C08F36/04 C08F36/14 C08C19/22 C08C19/25 C08C19/44 C08F279/02 C08K3/04 C08K3/36 

FIELD: chemistry.

SUBSTANCE: invention relates to a modified conjugated diene-based polymer, a method of its preparation, as well as a rubber composition comprising it. The conjugated diene modified polymer contains a Si atom and a N atom, and the N content of the polymer is 150 ppm or more by weight. The Mooney viscosity change rate (MV_R) is 20% or less. A method of producing a modified conjugated diene polymer involves polymerizing a conjugated diene monomer or a conjugated diene monomer and a vinyl aromatic compound monomer in the presence of a polymerization initiator in a carbon solvent to obtain an active first chain; reaction of the active first chain with an alkoxysilane-based modifier to produce a modified active first chain; and reaction of the modified active first chain and a macromonomer containing a repeating unit derived from the N-functional monomer.

EFFECT: resulting polymer has excellent processability and good tensile strength and viscoelastic properties.

17 cl, 3 tbl, 2 ex