New polymer-modified, oxidized asphalt compositions and...

Details New polymer-modified, oxidized asphalt compositions and... New polymer-modified, oxidized asphalt compositions and...

C - Chemistry, Metallurgy

08

L

C08L 95/00 (2006.01)

Patent

CA 2089598

Disclosed in this invention are novel asphaltic compositions having improved viscoelastic properties and storage stability. They contain neutralized mixtures of oxidized asphalt and an acid functionalized polymer, which polymer is selected from the group consisting of sulfonated EPDM, sulfonated styrene-butadiene, and acrylic acid terpolymers, in an amount that is sufficient to result in an asphaltic composition having a softening point greater about 55°C and a viscosity in the range from about 150 cP to 2000 cP or from about 3000 cP to about 8000 cP at 135°C. The basic neutralizing agent used in these compositions contain cations having a valence of from +1 to +3, preferably +2. The invention also relates to the products produced by the process and method of making the compositions. The compositions can be used as a binder in paving applications, particularly as a binder in dense graded and in open graded hot mix pavements.

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