Method for the preparation of bitumens modified by polymers
AssigneeElf Union
InventorsFredj Fitoussi, Paul Maldonado
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Abstract
A process for the preparation of bitumen-polymer compositions, characterized by the fact that the bitumens are modified by grafting of a dihalopolybutadiene polymer that serves as a receptive structure to block polymers and to elastomers co-vulcanizable with the grafted bitumen. The elastomers are selected from the group that includes linear polybutadiene-polystyrene block copolymers, a polystyrene-polybutadiene block copolymer, and a vulcanizable polynorbornene rubber. They are used as road and industrial bitumens.
Claims12
A process for the preparation of a bitumen-polymer composition comprising grafting, by heating in the presence of a catalyst, at a temperature of 180.degree. C. for 3 hours, 5 to 10 parts of a dihalopolybutadiene polymer on to 100 parts of the bitumen, said polymer serving as a receptive structure for block polymers and to elastomers co-vulcanizable with the grafted bitumen.
Dependencies are inferred from the claim text.