METHOD OF PREPARING POLYSULFIDE OLIGOMERS

摘要

technology of synthesis of polysulfide oligomers used as substrate of sealing, adhesive and pouring materials in various industries including optics and optoelectronics. SUBSTANCE: described is method of preparing polysulfide oligomers by reacting organic di- and polyhalides of general formula: R(Cl)n wherein R is aliphatic hydrocarbon or oxygen-containing hydrocarbon radical, n is equal or more than 2, in aqueous medium with sodium thiosulfate and subsequently reacting thiosulfate derivatives with sodium hydrosulfide during heating operation. Reaction of di- and polyhalides with sodium thiosulfate is carried out in the presence of sodium sulfite in amount from 5 to 20 wt.pts per 100 wt.pts of di- and polyhalides. EFFECT: optically pure polysulfide oligomers with light transmission value up to 100%. 2 ex