New polymer-modified, functionalized asphalt compositions...

Details New polymer-modified, functionalized asphalt compositions... New polymer-modified, functionalized asphalt compositions...

C - Chemistry, Metallurgy

08

L

C08L 95/00 (2006.01)

Patent

CA 2089599

Disclosed in this invention are novel asphaltic compositions and the method of making same. The compositions are made by combining an asphalt that contains sulfonate or sulfonic acid groups, a polymer preferably of butyl rubbers, styrene-butadiene linear diblock polymer, styrene-butadiene-styrene linear or radial triblock polymer and EPDM that has been sulfonated, and mixtures thereof, and a basic neutralizing agent that contains cations having a valence from +1 to +3. The amount of polymer is an amount less than 7 wt.% of total polymer-asphalt composition that is sufficient to produce an asphaltic composition having a viscosity at 135°C in the range of from about 150 cPs to about 2000 cPs or from about 3000 cPs to about 8000 cPs. The novel asphaltic compositions have improved viscoelasticity, softening point, and storage stability. The compositions can be used as binders in road paving applications.

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