BUTADIENE POLYMERS' AND BUTADIENE/STYRENE COPOLYMERS' PRODUCTION PROCESS Russian patent published in 2004 - IPC

FIELD: polymer production. SUBSTANCE: invention relates to production of in-solution polymerization rubbers: polybutadiene and static butadiene/styrene copolymers for manufacture of tires with high performance characteristics. (Co)polymerization of corresponding monomers is carried out in hydrocarbon solvents at temperatures between 0 and 100 C in presence of hydrocarbon solvent soluble catalytic complex of following formula: wherein R₁ represents ethyl, butyl, or their mixture; R₂ is olybutadienyl, polyisoprenyl, or polystyryl; Me represents Na or K; and R₃ methyl or ethyl. When polymerization is ended, a coupling agent is added, in particular tetraethoxysilane or silicon tetrachloride at active metal-tocoupler molar ratio 1:(0.25-0.1). Before isolation of polymer, solution is supplemented by high-aromatic oil at weight ratio to polymer 1:(0.17-0.37). Process is further characterized by molar ratio (Na, K)/Li/amine equal to (0.1-1.5):1:(0-1.0) and consumption of active metal 5-12 mole per 1 t monomers. Preparation of butadiene/styrene copolymers cannot be carried out in presence of modifying additive having a certain structure. EFFECT: improved consumer's quality of rubbers. 3 cl, 6 tbl, 24 ex