FIELD: chemistry.
SUBSTANCE: invention relates to a method of producing a copolymer of isobutylene and isoprene, a copolymer obtained using said method and a polymer article containing a copolymer. Method of producing a copolymer of isobutylene and isoprene consists in that, at step (a), a diluent and a mixture of monomers containing isobutylene and isoprene are taken, and a reaction medium is obtained. Weight ratio of the mixture of monomers and the diluent ranges from 5:95 to 95:5. Step (b) comprises polymerising a mixture of monomers inside the reaction medium in the presence of a system of initiators to form a copolymer solution containing a copolymer which is mainly dissolved in a reaction medium containing a diluent and residual monomers. Further, at step (c) residual monomers are separated from reaction medium. Step (b) is carried out at temperature in range from -95 °C to -60 °C. Diluent contains at least 95.0 wt. % of one or more aliphatic hydrocarbons having a boiling point in range of 5 °C to 95°C at pressure of 1013 hPa, and contains maximum 1.0 wt. % of halogenated hydrocarbons. Copolymer of isobutylene and isoprene has a sequence of monomer links of the copolymer, determined using equation (I) F = mA / (1 + mA)2 (equation I), in which A is molar ratio of isoprene to isobutylene in copolymer defined by 1H NMR, F is a fraction of the isoolefin-isoprene-isoprene triad in the copolymer, determined by 13S NMR; m is in the range of [1.30-(0.025×MOS)]≥m≥[1.15- (0.025×MOS)], MOS content of isoprene in copolymer in mol. % determined by 1H NMR. A polymer article is obtained from the above copolymer in a cured or non-cured form.
EFFECT: invention enables to obtain isobutylene and isoprene copolymers which have a uniform distribution of polymer crosslinking centers and a lower value of m.
42 cl, 2 tbl, 5 ex
