Patent ID: 8664303

Claim:
A modified asphalt binder composition, comprising: (a) about 40% by weight to about 98.9% by weight asphalt binder material; (b) about 0.5% by weight to about 25% by weight crumb rubber; (c) about 0.5% by weight to about 30% by weight of at least one synthetic polymer; and (d) about 0.05% by weight to about 5% by weight of at least one acid selected from the group consisting of phosphoric acid, polyphoshoric acid, sulfuric acid at more than 90% wt, boric acid, adipic acid, citric acid, oxalic acid, tartaric acid, maleic acid, valeric acid, succinic acid, fumaric acid, glutamic acid, phatalic acid, acetic acid, and combinations thereof.