Modified asphalt compositions
AssigneesEastman Chemical Company, PRI Asphalt Technologies, Inc.
InventorsRichard Kingsley Stuart, Jr., Jeffery Lynn Presley, Kenneth Francis Grzybowski
Life of this patent
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Abstract
A modified asphalt composition is provided comprising at least one plastomer, at least one elastomer, at least one crosslinking agent and asphalt. More specifically, a modified asphalt composition is provided comprising an oxidized polyethylene, a styrene-butadiene-styrene block copolymer, sulfur, and asphalt. A hot mix asphalt composition is also provided comprising the modified asphalt composition and aggregate. Processes for producing the modified asphalt composition and the hot mix asphalt composition are also provided as well as articles produced from these inventive compositions.
Claims44
A pellet comprising at least one plastomer, at least one crosslinking agent, and at least one elastomer for use as an asphalt modifier, wherein said plastomer comprises an oxidized polyolefin and wherein said crosslinking agent is present in said pellet in an amount ranging from about 0.1% by weight to about 5% by weight based on the weight of the elastomer.
A modified asphalt composition comprising at least one plastomer, at least one elastomer, at least one crosslinking agent, and asphalt, wherein said plastomer comprises an oxidized polyolefin and wherein said crosslinking agent is at least one selected from the group consisting of elemental sulfur, hydrocarbyl polysulfides, peroxides, and transition metals.
A process for producing a modified asphalt composition comprising contacting at least one plastomer, at least one elastomer, at least one crosslinking agent and asphalt, wherein said plastomer comprises an oxidized polyolefin and wherein said crosslinking agent is at least one selected from the group consisting of elemental sulfur, hydrocarbyl polysulfides, peroxides, and transition metals.
A process for producing a modified asphalt composition said process comprising:
- 1) contacting at least one plastomer, at least one elastomer, and at least one crosslinking agent to produce a pellet, wherein said plastomer is oxidized polyethylene;
- and
- 2) adding said pellet to asphalt in a mixing zone to produce said modified asphalt composition.
A process for producing a modified asphalt composition said process comprising:
- 1) contacting at least one plastomer and at least one elastomer in an extruder zone to produce a plastomer/elastomer pellet;
- 2) contacting at least one plastomer and at least one crosslinking agent in an extruder zone to produce a plastomer/crosslinking agent pellet;
- 3) adding said plastomer/elastomer pellet and said plastomer/crosslinking agent pellet to at least one molten asphalt in a mixing zone to produce a modified asphalt composition;
- 4) mixing said modified asphalt mixture in said mixing zone to disperse the plastomer and elastomer in said plastomer/elastomer pellet to produce the modified asphalt composition.
A process for producing a hot mix asphalt composition comprising contacting at least one plastomer, at least one elastomer, at least one crosslinking agent, asphalt, and aggregate, wherein said plastomer comprises an oxidized polyolefin and wherein said crosslinking agent is at least one selected from the group consisting of elemental sulfur, hydrocarbyl polysulfides, peroxides, and transition metals.
A process for producing a hot mix asphalt composition said process comprising:
- 1) contacting at least one plastomer and at least one elastomer in an extruder zone to produce a plastomer/elastomer pellet;
- 2) contacting at least one plastomer and at least one crosslinking agent in an extruder zone to produce a plastomer/crosslinking agent pellet;
- 3) adding said plastomer/elastomer pellet and said plastomer/crosslinking agent pellet to at least one molten asphalt in a mixing zone to produce a modified asphalt mixture;
- 4) mixing said modified asphalt mixture in said mixing zone to disperse the plastomer, elastomer, and crosslinking agent to produce said modified asphalt composition;
- and
- 5) contacting said modified asphalt composition with aggregate to produce said hot mix asphalt composition.
A pellet comprising at least one plastomer and at least one crosslinking agent for use as an asphalt modifier, wherein said plastomer comprises an oxidized polyolefin and wherein said crosslinking agent is at least one selected from the group consisting of elemental sulfur, hydrocarbyl polysulfides, peroxides, and transition metals.
A modified asphalt composition comprising at least one plastomer, at least one elastomer, at least one crosslinking agent, and asphalt, wherein said plastomer comprises an oxidized polyolefin and is present in said modified asphalt composition in an amount from about 0.1% by weight to about 10% by weight based on the weight of the modified asphalt composition.
A modified asphalt composition comprising at least one plastomer, at least one elastomer, at least one crosslinking agent, and asphalt, wherein said plastomer comprises an oxidized polyolefin and wherein said elastomer is present in said modified asphalt composition in an amount from about 0.1% by weight to about 10% by weight based on the weight of the modified asphalt composition.
A modified asphalt composition comprising at least one plastomer, at least one elastomer, at least one crosslinking agent, and asphalt, wherein said plastomer comprises oxidized polyethylene.
Dependencies are inferred from the claim text.