Patent ID: 8124677

Claim:
A modified asphalt binder composition prepared by: combining asphalt binder, from about 0.05 to about 5 parts by weight phosphorus pentasulfide per 100 parts by weight asphalt binder, and less than 2.5parts by weight unsaturated polymer, per 100 parts by weight asphalt binder, to thereby produce a modified asphalt binder composition characterized by an elongation recovery at 25° C., as determined according to AASHTO T301, of greater than 75% and where the modified asphalt binder composition characterized by a phase angle at 76° C., as determined according to AASHTO T315, of less than 80° , where the phosphorus pentasulfide includes a blend of P 4 S 10 and P 4 S 9 .