Abstract: An asphalt-based roofing product includes an asphalt-based substrate such as asphalt-saturated fiberglass or cellulose felt, a non-asphalt, thermoplastic, water-resistant adhesive on the surface of the asphalt-based substrate, and a plurality of roofing granules embedded in the asphalt such that the adhesive provides an interface between the asphalt and roofing granules. The adhesive is present in an amount sufficient to improve the adhesion of the roofing granules to the asphalt.

Abstract: A process for improving the adhesion of roofing granules to a hot asphalt surface in the manufacture of a roofing product. Onto an asphalt-based substrate having a hot asphalt surface, an amount of a non-asphalt adhesive effective for improving adhesion of roofing granules to the hot asphalt surface is applied and then roofing granules are embedded on the hot asphalt surface. The non-asphalt adhesive can be composed of or include as a component one or more of polyolefins, ethylene-vinyl acetate copolymers, ethylene-ethyl acetate copolymers, ethylene-n-butylacrylate polymers, ethylene-methylacrylate polymers, styrene-containing block or graft copolymers, polyamide terpolymers, hydrocarbon rubbers, polyesters, polyurethanes, and siloxanes. The resulting roofing product includes an asphalt-based substrate with an asphalt surface having roofing granules imbedded thereon with a non-asphalt adhesive at the interface between the asphalt and roofing granules.