FIELD: chemistry.
SUBSTANCE: group of inventions relates to modified polymer based on conjugated diene, obtained as a result of continuous polymerization, which is characterized by excellent recyclability, a narrow molecular weight distribution, and excellent physical properties, and a rubber composition intended for use in the manufacture of a tire containing it. Modified polymer based on conjugated diene is characterized by the presence of a unimodal profile of a curve of molecular weight distribution, obtained using gel-penetrating chromatography, molecular weight distribution ranging from 1.45 to less than 1.56, and a Si content level ranging from 128 ppm to 269 ppm per the weight, while modified polymer based on conjugated diene contains a repeating link obtained from aromatic vinyl monomer in the amount ranging from more than 0 wt.% to less than 15 wt.%. In this case, Si content is measured using the ICP analysis method using optical emission spectroscopy with inductively coupled plasma, where modified polymer based on conjugated diene is obtained by a method including a stage of polymerization of monomer based on conjugated diene or vinyl-aromatic-based monomer and monomer based on conjugated diene in the presence of an organometallic compound in a hydrocarbon solvent to obtain active polymer, which is combined with an organometallic compound (S1), and a stage of the reaction or combination between active polymer obtained at the stage (S1) and a modifier (S2), where the stage (S1) is continuously carried out in two or more polymerization reactors, and a degree of conversion during polymerization in the first reactor among polymerization reactors is 50% or less. A rubber composition for use in the manufacture of a tire, containing modified polymer based on conjugated diene and a filler, is also described.
EFFECT: provision of modified polymer based on conjugated diene, characterized by improved mechanical properties under tension, viscoelastic properties and recyclability characteristics.
7 cl, 3 dwg, 6 tbl, 22 ex
