METHOD OF PRODUCING POLYDIENES WITH HIGH CONTENT OF VINYL LINKS Russian patent published in 2012 - IPC C08F136/04 C08F136/06 C08F136/08 

FIELD: chemistry.

SUBSTANCE: method of producing polydienes with high content of vinyl links involves polymerisation of dienes in the medium of a hydrocarbon solvent in the presence of an anionic initiator consisting of isoprenylmagnesium and an organic compound of an alkali metal, followed by deactivation of the catalyst, stabilisation and extraction of the polymer. The organic compound of an alkali metal used is ethyl ether of sodium ethylene glycolate, ethyl ether of potassium ethylene glycolate or sodium tetrahydrofurfurylate with molar ratio alkali metal: Mg 1:(0.8-1.5) and the process is carried out while feeding the organic compound of alkali metal into a mixture containing a monomer and a solvent, followed by extraction of isoprenylmagnesium. The mixture containing a monomer and a solvent can be fed fractionally.

EFFECT: obtaining polydienes in a wide range of molecular weight values with a different microstructure, obtained polydienes have different glass transition temperature values, which widens the field of their use, as well as good physical and mechanical properties of hardened samples.

2 cl, 1 tbl, 10 ex