Process for preparing bitumen / functionalised elastomer compositions, their use in coatings.

It GETS IN CONTACT BETWEEN 100 ° C AND 230 ° CY stirring, bitumen, an elastomer, a functionalizing agent and optionally a peroxide compound. Functionalizing agent is a polyester ACID thiolcarboxylic or a reaction product of an acid or sulfur ESTER thiolcarboxylic ETHYLENE. The elastomer can also be preformed, and then be incorporated into the bitumen. THE LEARNED compositions may be used directly or after dilution to form BITUMINOUS BINDERS FOR CONDUCTING ROAD COATINGS, COATINGS AND COATING SEALING.