Patent ID: 8664302

Claim:
A process for preparing a polymer modified asphalt (PMA) comprising: i) providing a polymer-asphalt master batch comprising at least one polymer and a first asphalt; ii) providing an asphalt-cross linking agent blend comprising at least one cross linking agent and a second asphalt, wherein said asphalt-cross linking agent blend is prepared by mixing the at least one cross linking agent into the second asphalt at a temperature of about 120 to about 200° C., for about 0.2 to about 3.0 hours; iii) blending a predetermined amount of the polymer-asphalt master batch with a predetermined amount of the asphalt-cross linking agent blend to form a PMA blend; and iv) mixing the PMA blend for a period of time to allow a polymer network to form within the first and second asphalt, wherein the mixing step is performed without substantial delay following blending step iii).