Polymer-modified, vulcanized asphalt composition and its...

Details Polymer-modified, vulcanized asphalt composition and its... Polymer-modified, vulcanized asphalt composition and its...

2007-07-10

2007-07-10

Szekely, Peter (Department: 1714)

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

Synthetic resins

Processes of preparing a desired or intentional composition...

C524S069000, C524S070000, C524S071000

Reexamination Certificate

active

10915176

ABSTRACT:
A method is provided for improving high temperature performance grade properties of polymer-modified, vulcanized asphalt by treating an asphalt cement under mild oxidizing conditions sufficient to provide a change in viscosity per hour as measured at 140° C. of less than about 500 poises per hour, of said asphalt cement, adding 1 wt. % to 10 wt. % of a polymer based on weight of said asphalt cement, and vulcanizing the polymer-containing asphalt cement. The invention further relates to asphalt compositions thus made and paving compositions containing these asphalt compositions.

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