Patent ID: 7048990
Filing Date: 2006-05-23
Classification: B32B,D06N,E04D,Y10T

Abstract:
1. A shingle comprising a base sheet having a plurality of fibers, said base sheet having a top and a bottom, said top having first and second portions, said first portion of said top being an exposed portion which is normally exposed when said shingle is in use, said second portion of said top being a headlap portion which is normally covered by other shingles when said shingle is in use, a first layer of asphalt over said first portion of said top, a second layer of asphalt over said headlap portion of said top, a third layer of asphalt under said bottom, at least one of said layers coating said base sheet, said first layer comprising a blend of asphalt and elastomeric polymer additives, said second and third layers comprising an oxidized asphalt substantially free from elastomeric polymer additives, said first layer contacting said third layer, and a layer of granules embedded in said first layer.