| abstract |
Cyclized polydienes devoid of crosslinked fractions are prepared by polymerizing conjugated diolefins in solution in a solvent consisting of a mixture of saturated hydrocarbons with 20-95% by weight, with respect to the mixture, of chlorinated saturated hydrocarbons, in the presence of from 0.1 to 10 moles for each 100 moles of diolefins, of a catalyst of the formula RnAl Cl3-n, where R is an alkyl radical with 1-6 carbon atoms and n is from 1 to 1.5. |