HIGH-NONSATURATED MULTIMODAL POLYISOOLEFINE COMPOSITION AND A METHOD FOR PRODUCTION THEREOF Russian patent published in 2019 - IPC C08L23/22 C08F2/14 

FIELD: technological processes.

SUBSTANCE: invention relates to a multimodal isoolefin copolymer composition for forming a molded article. Polyisoolefin-based copolymer composition has a multimodal molecular weight distribution and a level of unsaturation of more than 4 mol%, which can be obtained by copolymerisation of 70–96 vol% isoolefin monomer and 4–30 vol% β-pinene or multiolefin monomer based on isoolefin monomer volume and β-pinene or multiolefin monomer in solution containing 0–30 vol% of an aliphatic hydrocarbon diluent based on the volume of the solution, and initiating system based on aluminum alkyl halide. Multimodal molecular weight distribution of the composition contains a first molecular weight fraction having a peak molecular weight (M_p) of less than about 300 kg/mol, and a second molecular weight fraction having peak molecular weight (M_p) of more than about 1,000 kg/mol or at least 3 times more than M_p first molecular weight fraction.

EFFECT: composition is capable of processing, while maintaining physical characteristics and stability of dimensions required for treatment before vulcanisation.

13 cl, 12 dwg, 9 tbl, 37 ex