Patent ID: 6469075
Filing Date: 2002-10-22
Classification: C08L

Abstract:
A method for preparing asphalt and polymer compositions comprising:heating the asphalt in a stirred tank to a temperature sufficient to allow stirring of the asphalt in the tank, wherein said temperature is at least 330Â° F.; adding a thermoplastic elastomer to the tank in an amount not greater than twelve percent by weight of the total composition to form a mixture; adding a crosslinking composition to the composition; continue stirring and maintain the temperature in the tank for at least sixty minutes, wherein the crosslinking composition comprises at least 0.1 percent by weight based on the asphalt of zinc 2-mercaptobenzothiazole, and from 0.05 to 0.3 percent based on the asphalt of elemental sulfur, and wherein zinc 2-mercaptobenzothiazole is present in an amount greater than the elemental sulfur.