Patent Number: 7,820,739

Title: Modified asphalt binders and asphalt paving compositions

Abstract: A method for forming a modified asphalt binder composition, the method comprising preparing a phosphorus pentasulfide-binder concentrate by introducing and mixing phosphorus pentasulfide and asphalt binder, where the phosphorus pentasulfide-binder concentrate includes greater than 0.5 parts by weight phosphorus pentasulfide per 100 parts by weight asphalt, preparing a polymer-binder concentrate by introducing and mixing polymer and asphalt binder, where the polymer-binder concentrate includes greater than 5 parts by weight polymer per 100 parts by weight asphalt, and introducing and mixing the phosphorus pentasulfide-binder concentrate with the polymer-binder concentrate to form a modified asphalt binder composition, where the phosphorus pentasulfide includes a blend of P.sub.4S.sub.10 and P.sub.4S.sub.9.

Inventors: Hergenrother; William L. (Akron, OH), Boerner; Peter W. (Massillon, OH), Graves; Daniel F. (Canal Fulton, OH), Rademacher; Christine (Akron, OH), Reece; Timothy P. (Indianapolis, IN), Wissel; Herbert L. (Indianapolis, IN)

Assignee: Firestone Polymers, LLC & Heritage Research Group

International Classification: C08J 3/22 (20060101)

Expiration Date: 2018-10-26 0:00:00