Asphalt modifier composition and rubber-modified asphalt having increased storage stability
AssigneeLiberty Tire Recycling, LLC
InventorCharles Thomas Rosenmayer
Life of this patent
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Abstract
Asphalt modifier packages and rubber-modified asphalts including the packages are described. Asphalt modifier packages can include an amine functionalized wax and an elastomeric polymer in conjunction with ground tire rubber. Asphalt modifiers can include a ground tire rubber compounded with a reactive elastomeric terpolymer. Rubber-modified asphalts can exhibit an excellent stability of the ground tire rubber additive. Rubber-modified asphalts can exhibit a storage stability separation factor of about 6° F. or less, an MSCR Jnr value of from about 0.05 to about 2 at 3.2 kPa and 67° C., and an MSCR percent recovery of from about 20% to about 75% at 3.2 kPa and 67° C.
Claims14
An asphalt modifier package comprising ground tire rubber particles, an amine functionalized wax in an amount of from about 0.01 wt. % to about 10.0 wt. %, and an elastomeric polymer comprising epoxide functionality, wherein the elastomeric polymer is present in the asphalt modifier package in an amount of from about 0.01 wt. % to about 20 wt. %, wherein the amine functionalized wax comprises a hydrocarbon chain of nine carbons or greater and an amine functionality, the amine functionality having the following general structure:
- —NR1R2
- in which — represents a bond between the amine functionality and the hydrocarbon chain and R1 and R2 are the same or different from one another and are independently selected from hydrogen or C1 to C12 alkyl, wherein when R1 and R2 are each independently a C1 to C12 alkyl, R1 and R2 are optionally interconnected, and
- wherein the asphalt modifier package exhibits a storage stability separation value of 6° F. or less, as determined according to ASTM D 7173.
Dependencies are inferred from the claim text.