METHODS OF PRODUCING ALKYLSTYRENE AND ISOOLEFIN COPOLYMERS Russian patent published in 2015 - IPC C08F210/10 C08F210/14 C08F212/12 

FIELD: chemistry.

SUBSTANCE: present invention relates to a method of producing copolymers of C_4-7isoolefin monomers and C_1-7alkylstyrene monomers. Described polymerisation method for producing polymers from C_4-7isoolefin monomers and alkylstyrene monomers, the method including the following steps: a) feeding raw material streams into a reactor, the raw material streams including isoolefin and alkylstyrene monomers, where an alkyl substitute in the alkylstyrene is C_1-7alkyl, a diluent which includes methyl chloride and optionally 5-50 vol % of at least one hydrofluorocarbon and/or a nonpolar diluent, and a catalyst system, wherein the catalyst system is selected from either i) a weak Lewis acid with a HCl initiator, or ii) ethylaluminium dichloride, an initiator and an alcohol, an ester or particles containing ions selected from organic salts of the following: quaternary ammonium halides, quaternary phosphonium halides or oxonium ions; and b) providing contact between raw material streams inside the reactor such that monomers form a polymer in a suspension, wherein content of the polymer in the suspension provides concentration of the suspension higher than 22 wt %, wherein the molar ratio of the formed polymer to the initiator is not more than 4 moles polymer per mole initiator. An isoolefin-alkylstyrene polymer obtained using said method is also described.

EFFECT: obtaining a stable polymer suspension, high output and improved polymer properties.

8 cl, 1 tbl, 4 ex