FIELD: chemistry.
SUBSTANCE: invention relates to novel compositions of polyesters of formula (Ia-c), ammonium salts thereof and synthesis method thereof. The compositions can be used as soft steel corrosion inhibitors. n=2-4; X=H (Ia, Iб), NH4 (в); 
. The method involves reaction of hyper-branched polyester-polyol with c 2,4-bis(3,5-ditertbutyl-4-hydroxyphenyl)-1,3,2,4-dithiadiphosphethane-2,4-disulphide or 2,4-bis(4-phenoxyphenyl)-1,3,2,4-dithiadiphosphethane-2,4-disulphide in molar ratio 1:16 in conditions given in the claim.
EFFECT: high anticorrosion activity of the compounds.
4 cl, 3 ex, 1 tbl
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