FIELD: chemistry.
SUBSTANCE: invention relates to production of biodegradable polymers, particularly to a method of producing polylactides from a catalyst system, used in the food industry, medical engineering, pharmacology etc. The method involves opening and then polymerisation of rac- or L-lactide in a monomer melt at 120-200°C in the presence of a metal and with or without additives RxYyR'z. The metal has low electronic work function. 
, where M, M' and Y denote a metal selected from Li, Na, K, Mg, Ca, Fe, Al, Ga, Zn, La, Nd, Sm; RxYyR'z denote an adamantyl alcohol or an inorganic compound, R, R', A denote oxygen, halogen ion, hydroxide ion and an acid residue.
EFFECT: invention enables to obtain polylactide with a faster polymerisation process, high degree of monomer conversion and minimisation of formation of by-products.
14 cl, 2 tbl, 5 dwg, 7 ex
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