METHOD OF SYNTHESIS OF BUTADIENE-STYRENE RUBBER Russian patent published in 2003 - IPC

FIELD: rubber industry. SUBSTANCE: invention relates to method of synthesis of synthetic rubber, in part, butadiene-styrene rubber of solution polymerization, polymerization used in production of tires, rubber-technical articles (RTA) and other branches and can be used in petrochemical industry. Method involves the application of compound as modifying addition taken among the group comprising the following substances: diethylene glycol dimethyl-, diethyl-, divinylester; methyl-, ethyl-, di-, tetrahydrofurfuryl ester and/or sodium tetrahydrofurfurylate; sodium styryl-, nonyl-substituted phenolate as measured for the mole ratio to n-butyllithium in the range 0.05-0.8. Divinylbenzene is used as a coupling agent taken as measured in the mole ratio from 0.1 to 0.6 to n-butyllithium. These reagents are fed to charge and polymerization process is carried out up to conversion 95%, not less, at temperature 30-80 C. If necessary, up to the conversion attainment 95%, not less, the compound taken among group including tin tetrachloride, tributyltin chloride, dibutyltin dichloride, N-methyl-α-pyrrolidone, 4-nitroso-diphenylamine, N-butylpropionaniline, 2-chloro-4,6-bis-(diethylamine)-sym-triazine, 4,4-bis-(dibutylamino)-benzophenone, 4-diethylamino-chlorobenzophenone as measures in the mole ratio to n-butyllithium from 0.1 to 0.8 and kept at the same temperature for 15-60 min and/or petroleum oil taken among the group including netoxol, plastar-20K, PN-6K, stabilplast-62 as 40-50 wt.% solution in hydrocarbon as measured of oil content in rubber in the range 10-30 wt.%. Invention allows to obtain rubber with preferential content of vinyl links, good technological effectiveness in processing, enhanced elasticity indices by spring back in alkylaromatic and other solvents. EFFECT: improved method of synthesis. 3 cl, 1 tbl