| abstract |
The invention relates to techniques for removing catalyst residues from low molecular weight polyisobutylene obtained in the presence of titanium and trialkylaluminium halides in hydrocarbon solvents, and the polymer itself is used as additives (directly or after modification) to motor and diesel oils, for the manufacture of glue and other purposes. The essence of the invention: the solution lies in the fact that the purification process is carried out in two stages, in the first of which the hydrocarbon polymer solution is washed with acidified water with a pH of 1-5 at a temperature of 20-50C and a volumetric ratio of polymerizate: water in the range of 0.5 - 1, 0, and on the second - with water with a pH of 7.0 ± 0.5 at a volumetric ratio of the phases of the polymerizate: water 0.75 - 1.0 at 50-80 ° C, followed by phase separation and holding the polymerizate at the same temperature for at least 20 minutes . The present invention allows to obtain a polymer that is practically free of catalyst residues and completely colorless and transparent. |