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US 8,580,874 B2Granted
Polymer-modified asphalt compositions
AssigneesFirestone Polymers, LLC, Heritage Research Group
InventorsHerb Wissel, Peter Boerner, Daniel Graves, Christine Rademacher, Timothy Reece
Life of this patent
Estimating the term…
Abstract
A modified-asphalt composition prepared by introducing a diene end-capped block copolymer with a molten asphalt composition.
Claims22
A process for preparing a modified asphalt composition, the process comprising:
- introducing a molten asphalt composition;
- introducing from about 0.1 to about 10 parts by weight, per 100 parts by weight of the modified asphalt composition, of a polymeric blend including a star-branched diene end-capped block copolymer and a linear diene end-capped block copolymer into the molten asphalt composition, where the star-branched 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 that couples at least three chains of a living polymer defined by formula d-V-D⊖, and x is an integer from 3 to 10, and where the linear block copolymer is defined by the formula
- (D-V-d)
- where each D is independently a polydiene block, each V is independently a vinyl aromatic block, each d is a polydiene end cap, where the ratio of star-branched diene end-capped block copolymer to linear diene end-capped block copolymer is at least 0.5:1 and less than 9.5:1.
3 more elements
A process for preparing a modified asphalt composition, the process comprising:
- introducing a molten asphalt composition;
- introducing from about 0.1 to about 10 parts by weight, per 100 parts by weight of the modified asphalt composition, of a polymeric blend including a star-branched diene end-capped block copolymer and a linear diene end-capped block copolymer into the molten asphalt composition, where the star-branched 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 that couples at least three chains of a living polymer defined by formula d-V-D⊖, and x is an integer from 3 to 10, and where the linear block copolymer is defined by the formula
- (D-V-d)
- where each D is independently a polydiene block, each V is independently a vinyl aromatic block, each d is a polydiene end cap, where the copolymer is star coupled by employing a tri-ester.
3 more elements
A process for preparing a modified asphalt composition, the process comprising:
- introducing a molten asphalt composition;
- introducing from about 0.1 to about 10 parts by weight, per 100 parts by weight of the modified asphalt composition, of a polymeric blend including a star-branched diene end-capped block copolymer and a linear diene end-capped block copolymer into the molten asphalt composition, where the star-branched 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 that couples at least three chains of a living polymer defined by formula d-V-D⊖, and x is an integer from 3 to 10, and where the linear block copolymer is defined by the formula
- (D-V-d)
- where each D is independently a polydiene block, each V is independently a vinyl aromatic block, each d is a polydiene end cap, where the copolymer is star-coupled by employing a di-ester.
3 more elements
A process for preparing a modified asphalt composition, the process comprising:
- introducing a molten asphalt composition;
- introducing from about 0.1 to about 10 parts by weight, per 100 parts by weight of the modified asphalt composition, of a polymeric blend including a star-branched diene end-capped block copolymer and a linear diene end-capped block copolymer into the molten asphalt composition, where the star-branched 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 that couples at least three chains of a living polymer defined by formula d-V-D⊖, and x is an integer from 3 to 10, and where the linear block copolymer is defined by the formula
- (D-V-d)
- where each D is independently a polydiene block, each V is independently a vinyl aromatic block, each d is a polydiene end cap, further comprising the step of introducing to the molten asphalt from about 0.1 parts to about 10 parts by weight curative, per 100 parts by weight asphalt, and where the polymeric blend is characterized by a melt index (ASTM D-1238, 2.16 kg @ 190° C.) of at least 5 and less than 12 dg/min.
3 more elements
Dependencies are inferred from the claim text.