Bitumen and halogenated vinyl aromatic-conjugated diolefin block copolymer compositions
 A bitumen composition is provided which contains a block copolymer of one or more halogenated vinyl aromatic blocks and one or more conjugated diolefin blocks. The composition does not phase separate upon storage for five days at 160.degree. C. and has excellent ductility and elasticity. The utilization of halogenated block copolymers also results in improved high service temperature viscosity and moduli with excellent resistance to thermal cracking at low service temperatures. The block copolymer is preferably a hydrogenated block copolymer. The bitumen is preferably halogenated. 
Shell Oil Company
C
C08L
inventional
James H. Michael A. Daniel B.
Collins Masse England