Method of making bitumen/polymer compositions, compositions obtained by said method and their uses.

摘要

Process for the preparation of a bitumen-polymer composition by mixing bitumen and polymer at a temperature of between 190 and 300 DEG C, more particularly between 220 and 260 DEG C, for a period preferably longer than 30 minutes. According to the invention, preliminary tests are used to determine the aromaticity contents of the mixture, which are associated with a Fraass point of the final composition which is equal to or lower than -13 DEG C and with a storage stability of this composition, defined by its ring-and-ball DELTA , which is equal to or lower than 5 DEG C. Before performing the mixing of the bitumen and of the polymer and/or during this mixing, the aromaticity content of the mixture is adjusted to bring it into the said range by adding at least one aromatic compound to the bitumen and/or to the polymer.