METHOD OF PRODUCTION OF COMPOSITION OF BUTADIENE-STYRENE BLOCK COPOLYMERS AND BUTADIENE-STYRENE BLOCK COPOLYMER COMPOSITION PRODUCED BY THIS METHOD Russian patent published in 2004 - IPC

FIELD: production of block copolymer compositions.

SUBSTANCE: method of production of butadiene-styrene composition of block copolymers (AB)_nX having average weight molecular mass of 140·10³ to 300·10³ and polydispesivity of 1.20-1.50 and A₁B₁ having average weight molecular mass of 50·10³-150·10³ and polydispersivity of 1.20-1.40 (where A, A₁ are polystyrene blocks, B, B₁ are polybutadiene blocks. X is fragment of combining agent, n≥2, mass ratio of blocks A:B and A₁:B₁=(20-35):(80:65)% consists in successive polymerization of styrene and butadiene in medium of hydrocarbon solvent in presence of lithium organic initiating agent followed by stabilization and mixing of block copolymers without separation from solutions after polymerization at mass ratio of (AB)_nX:A₁B₁= 1 : (0.06-0.15); flows of solutions of block copolymers are directed to averager through flow-type static mixer at rate of flows of block copolymer : antioxidant ≥ 1600:8.0 kg/h and mass ratio of block copolymer : antioxidant = 1: (0.005-0.0075); mixing in averager is continued for at least an hour at temperature not below 40 C and composition of block copolymers is separated by aqueous degassing method. Additionally, petroleum or mineral oil may be introduced in the amount of 5-8 parts by mass per 100 parts by mass of block copolymer composition at flow rate of block copolymer : oil ≥ 1600:800 kg/h.

EFFECT: enhanced heat resistance; increased productivity; improved technological properties of block copolymers.

4 cl, 4 tbl, 14 ex