Patent ID: 7998265

Claim:
An asphalt composition made by a plurality of steps comprising: heating a base asphalt to a temperature of from 300° F. to 400° F.; introducing a polymer to form a polymer modified asphalt, and blending the polymer with the asphalt, wherein said asphalt has from 0.1 wt. % to 5 wt. % of the polymer; adding zinc oxide before or after the polymer and before any acid addition, and further blending the asphalt; adding from 0.01 wt, % to 2 wt. % of a mineral acid, and blending the asphalt; and wherein at least a portion of one or more of the blendings after zinc oxide addition occurs in the presence of an oxygen containing gas, and wherein said polymer modified asphalt is comprised of at least 90 wt. % to 95 wt. % of asphalt.