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US 8,008,377 B2Granted
Modified asphalt binders and asphalt paving compositions
AssigneesFirestone Polymers, LLC, Heritage Research Group
InventorsChristine Rademacher, Daniel Graves, Herb Wissel, Timothy Reece
Life of this patent
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Abstract
A process for preparing a modified asphalt binder composition, the process comprising mixing asphalt, an unsaturated polymer, and an organothionating agent to form a modified asphalt composition.
Claims9
A process for preparing a modified asphalt binder composition, the process comprising:
- mixing asphalt, an unsaturated polymer, and an organothionating agent to form a modified asphalt composition, where the organothionating agent is defined by the formula
- where each R is independently a monovalent organic group and each δ is independently a bond or a heteroatom, or where the organothionating agent is defined by the formula
- where φ is a phenyl group or substituted phenyl group and R is a monovalent organic group.
A process for preparing a modified asphalt binder composition the process comprising:
- introducing an polymer to an asphalt binder;
- and
- introducing an organothionating agent to an asphalt binder, where said step of introducing organothionating agents to the asphalt includes adding an organothionating agent composition that includes less 5% by weight hydrocarbon material, where the organothionating agent is defined by the formula
- where each R is independently a monovalent organic group and each δ is independently a bond or a heteroatom, or where the organothionating agent is defined by the formula
- where φ is a phenyl group or substituted phenyl group and R is a monovalent organic group.
2 more elements
A method for forming a modified asphalt binder composition, the method comprising:
- preparing an organothionating agent-binder concentrate by introducing and mixing organothionating agent and asphalt binder, where the organothionating agent-binder concentrate includes greater than 0.5 parts by weight organothionating agents 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 organothionating agent-binder concentrate with the polymer-binder concentrate to form a modified asphalt binder composition, where the organothionating agent is defined by the formula
- where each R is independently a monovalent organic group and each δ is independently a bond or a heteroatom, or where the organothionating agent is defined by the formula
- where φ is a phenyl group or substituted phenyl group and R is a monovalent organic group.
4 more elements
Dependencies are inferred from the claim text.