Patent ID: 7276557

Claim:
A composition comprising at least two hydrocarbon resins, wherein one of the resins is a petroleum hydrocarbon resin having an Mw of 500–6000 and grafted with a graft monomer selected from acids, anhydrides, imides, amides, alcohols and derivatives thereof, wherein the composition is substantially free of grafted oligomers of cyclopentadiene and substituted cyclopentadiene comprising norbornyl ester groups and wherein: if the graft monomer is an acid, anhydride, imide, amide or derivative thereof, the Saponification number of the at least two hydrocarbon resins is 1–100, or if the graft monomer is an alcohol or derivative thereof, the hydroxyl number of the at least two hydrocarbon resins measured according to ASTM E 222-94 is 1–100.