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.
Claims44
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The process of claim 39, where each d includes from about 10 to about 500 mer units deriving from the polymerization of conjugate diene monomer.
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The process of claim 39, where each D includes from about 400 to about 1,200 mer units deriving from the polymerization of conjugated diene monomer.
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The process of claim 39, where each V includes from about 100 to about 500 mer units deriving from the polymerization of vinyl aromatic monomer.
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The process of claim 39 where d derives from the polymerization of 1,3-butadiene.
The process of claim 39, where D derives from the polymerization of 1,3-butadiene.
The process of claim 39, where V derives from the polymerization of styrene.
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The process of claim 39, where the copolymer is star coupled by employing a tri-ester.
The process of claim 39, where the copolymer is star-coupled by employing a di-ester.
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The process of claim 39, where a derives from the concurrent oligomerization of divinylbenzene with living polymer chains.
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The composition of claim 41, where the mixture exhibits a melt index (ASTM D-1238, 2.16 kg @ 190° C.) of less than 2 dg/min.
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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 2 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.
A pavement prepared by:
- depositing onto a surface an asphalt paving composition prepared with a modified-asphalt composition prepared by
- 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 2 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.
A composition prepared by the process of claim 43.
Dependencies are inferred from the claim text.