PROCESS FOR PREPARING LOW-MOLECULAR POLYMERS Russian patent published in 1997 - IPC

FIELD: chemistry of polymers. SUBSTANCE: claimed invention describes preparation of low molecular weight (co)polymers based on butadiene, isoprene and styrene by anionic polymerization using chain transfer reaction. (Co)polymerization process is carried out in chain transfer toluene solution in the presence of modified organolithium initiator by continuous process at temperature from 35 to 90 C and monomer feed rate of 70-80 moles of monomer per 1 mole of organolithium compound. The organolithium compound modifier includes potassium or sodium alcoholates of bis-propylene glycol ester of ethylene glycol or tris-propylene glycol ester of glycerol or potassium or sodium alcoholates of ethylene diamine--tetra (hydroxymethylethylene), or mixture thereof with substituted potassium or sodium phenolates. Molar ratio of alkali metal or sum of alkali metals modifier to organolithium initiator is 0.05-1.5:1. Potassium to sodium molar ratio in mixture of alcoholates is 1:1-3. The claimed process makes it possible to reduce amount of organolithium initiator used. EFFECT: more efficient preparation process. 3 cl, 1 tbl