Functionalized elastomer/bituminous application re-in and manufacturing method of the end of the com

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PURPOSE : A method for preparing bitumen/functionalized elastomer compositions is provided which is used in surfacing, coating, and waterproofing materials. CONSTITUTION : Bitumen/functionalized elastomer compositions are prepared by contacting, between 100°C and 230°C and under agitation, an elastomer, a functionalising agent and optionally a peroxide compound. The functionalising agent is a thiolcarboxylic acid polyester or a reaction product of a thiolcarboxylic acid or ester with ethylene sulphide. The functionalized elastomer can also be preformed, then incorporated into the bitumen. The compositions are usable directly or after dilution, for forming bituminous binders to produce surfacing, coating and waterproofing materials.