Asphalt modifier
AssigneeAlphaflex Industries, Inc.
InventorWilliam E. Peters
Life of this patent
Estimating the term…
Abstract
A bitumen and asphalt modifier comprises thermoplastic elastomeric copolymer and an effective amount of a fibrillated polytetrafluoroethylene and molybdenum disulfide particles. The thermoplastic elastomeric copolymer comprises two incompatible polymers forming a two-phase copolymer including a thermoplastic end block polymer and an elastomeric mid block polymer. The asphalt modifier is made by mixing together under high shear particles of a thermoplastic elastomeric copolymer, fibrillatable polytetrafluoroethylene and molybdenum disulfide until the fibrillatable polytetrafluoroethylene is substantially fibrillated and combined with the thermoplastic elastomeric copolymer.
Claims24
An asphalt modifier comprising:
- a thermoplastic elastomeric block copolymer, and
- an effective amount of a fibrillated polytetrafluoroethylene and molybdenum disulfide particles.
A method of making a bitumen modifier, comprising
- placing a quantity of thermoplastic elastomeric block copolymer particles in a high shear mixer,
- placing an effective amount of fibrillatable polytetrafluoroethylene particles in said high shear mixer,
- adding an effective amount of molybdenum disulfide particles to the mixture of thermoplastic elastomeric block copolymer particle and fibrillatable polytetrafluoroethylene particles, and
- mixing and shearing the particles of thermoplastic elastomeric block copolymer, fibrillatable polytetrafluoroethylene and molybdenum disulfide until substantially all of the fibrillatable polytetrafluoroethylene particles are fibrillated and combined with the thermoplastic elastomeric block copolymer.
A method of making an asphalt modifier, comprising
- preparing a preassociated combination of fibrillatable polytetrafluoroethylene particles and molybdenum disulfide particles by agitating a mixture of the fibrillatable polytetrafluoroethylene particles and molybdenum disulfide particles until the molybdenum disulfide particles are, in substantial part, adherent to said fibrillatable polytetrafluoroethylene particles,
- placing a quantity of a thermoplastic elastomeric block copolymer particles in a twin screw extruder,
- adding an effective amount of preassociated fibrillatable polytetrafluoroethylene and molybdenum disulfide particle into said twin screw extruder,
- operating said twin screw extruder to uniformly combine fibrillated polytetrafluoroethylene and molybdenum disulfide particles with said thermoplastic elastomeric block copolymer and extrude the mixture for use as an asphalt modifier.
Dependencies are inferred from the claim text.