Polymer-modified functionalized asphalt compositions and methods

Details Polymer-modified functionalized asphalt compositions and methods Polymer-modified functionalized asphalt compositions and methods

1993-04-01

1994-09-20

Michl, Paul R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

524 59, 524 70, 524 71, C08L 9500

Patent

active

053489942

ABSTRACT:
Disclosed in this invention are novel road paving binder 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 amounts of each are effective to allow formation of one continuous phase or two interdispersed phases that do not segregate on standing at elevated temperatures associated with road paving. 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.degree. C. in the range of from about 150 cPs to about 2000 cPs or from about 3000 cPs to about 8000 cPs. The novel road paving asphaltic compositions have improved viscoelasticity, softening point, and storage stability. The compositions can be used as binders in road paving applications.

REFERENCES:
patent: 3642728 (1972-02-01), Canter
patent: 4514308 (1985-04-01), Clampitt et al.
patent: 4617227 (1986-10-01), Weaver

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