Patent ID: 8357735

Claim:
An asphalt paving laminate, comprising a base course and a wearing course bound atop said base course, said base course comprising: about 90 to about 98% by weight of a bitumen component having a PEN value of from about 20 dmm to about 55 dmm according to ASTM Method D5 at 25° C.; and about 2 to about 10% by weight of a diblock copolymer composition comprising (i) a copolymer comprising one polymer block of styrene and one polymer block of butadiene having a peak molecular weight from about 30,000 to about 78,000 and a vinyl content from about 35 to about 80 mol percent based upon the repeat monomer units of the butadiene block, and (ii) one or more block copolymers comprising two polymer blocks of styrene and one polymer block of butadiene, the block copolymer selected from linear triblock copolymers having a peak molecular weight that is 1.5 to 3 times the peak molecular weight of the diblock copolymer, multiarm coupled block copolymers having a peak molecular weight that is 1.5 to 9.0 times the peak molecular weight of the diblock copolymer, and mixtures thereof, wherein each block copolymer has a vinyl content from 35 to 80 mol percent based on the number of repeat monomer units in the butadiene block, wherein the ratio of (i) to (ii) in the copolymer composition is present at a ratio of greater than 1:1, wherein the base course is in a paving application and has a PEN value in the range of 10 dmm to 100 dmm according to ASTM Method D5 at 25° C.