Polymer-modified asphalt compositions
AssigneesFirestone Polymers, LLC, Heritage Research Group
InventorsChristine Rademacher, Timothy Reece, Herb Wissel, Daniel Graves, Peter Boerner
Life of this patent
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Abstract
A modified-asphalt composition prepared by introducing a diene end-capped block copolymer with a molten asphalt composition, where the block copolymer is defined by the formula α-(D-V-d)x where each D is independently a polydiene block, each V is independently a vinyl aromatic block, each d is a polydiene end cap, α is a coupling moiety, and x is an integer from 2 to 10.
Claims15
A process for preparing a modified asphalt composition, the process comprising introducing a molten asphalt composition and introducing from about 0.1 to about 10 parts by weight, per 100 parts by weight of the modified asphalt composition, of a linear diene end-capped copolymer defined by the formula:
- α-(D-V-d)x
- where each D is independently a polydiene block, each V is independently a vinyl aromatic block, each d is a polydiene end cap, α is a coupling moiety, and x is 2;
- where α is the residue of a coupling agent defined by the formula R1nM1X4-n, where each R1 is a monovalent organic group, M1 is tin, silicon, or germanium, X is a halogen atom, and n is 2;
- and
- where the coupling agent is a dichlorosilane selected from the group consisting of diphenyldichlorosilane, dihexyldichlorosilane, dioctyldichlorosilane, dibutyldichlorosilane, and dimethyldichlorosilane.
Dependencies are inferred from the claim text.