ORGANIC COMPOUNDS, CONTAINING DISULFIDE GROUPS, AS STABILISERS OF OXIDATION PROCESSES IN THERMOPLASTIC POLYMERS AND METHOD OF THEIR PRODUCTION Russian patent published in 2008 - IPC C08G75/14 C08L23/06 C08L27/06 

FIELD: chemistry.

SUBSTANCE: method of production of polydisulfides of aromatic series, applied as stabilisers of oxidation processes in thermoplastic polymers by dissolution of initial products (for instance, resorcin, gallic acid, hydroquinone, etc.) and possibly dissolution of obtained polymer, containing disulfide groups by carrying out reaction in two stages: 1-st stage is carried out at room temperature and finish after introduction of sulfur monochloride solution into reaction medium during 15-30 minutes, 2-nd stage is carried out in process of reaction medium heating, but not higher than solvent boiling temperature, until complete stop of hydrogen chloride formation, then precipitator is added, precipitated product is washed with water, then dried. Polysulfides obtained by said method can be applied for inhibiting oxidation processes in thermoplastic polymers in concentration 0.15-1.50 wt % under service conditions. Application of said compounds allows 1.5 time reducing of rate of oxidation processes in thermoplastic polymers in comparison with known stabilisers (for instance, phenosane). Advantages of claimed method lie in the following: time of reaction of synthesis is reduced more than 10 times; reaction temperature is reduced, heating of reaction medium being carried out only in conducting second stage of synthesis; reaction output increases and makes not less than 85%; amount of solvent is reduced, ration of the latter to initial substances being not more than 4 to 1.

EFFECT: reduction of reaction time, reaction temperature, increase of reaction output.

7 cl, 17 tbl, 23 ex