Reaction vessel, process for obtaining the latter and its use

The reaction vessel is equipped with an internal coating. This coating contains, as main ingredient, a linear or branched polyaromatic amine obtained by the reaction of compounds chosen from the polyaminobenzenes, the polyhydric phenols, the aminophenols, the substituted alkylaminophenols, the diphenylamines and the substituted alkyldiphenylamines. These compounds can be halogenated in the ring. The coating is applied to the internal surface of the vessel in an organic solvent. The vessels thus coated can be used for the polymerisation of olefinic monomers to avoid the formation of crusts.